I'm posting this here so mod devs get more visibility into the new things/changes before 1.1 is out - and probably a little after as well. Since not everyone reads the official changelog.
Modding:
- New item flag "spawnable", every item has to have that flag to be creatable through the shortcuts directly. (87777)
- Renamed create-blueprint-item shortcut action to spawn-item and item_to_create to item_to_spawn.
- Increased the total number of collision masks from 14 to 55. See the lua-api collision mask concepts page for which layers the game doesn't actively use.
- Changed collision mask 'layer-11' to 'rail-layer'.
- Changed collision mask 'layer-12' to 'transport-belt-layer'.
- Changed loader to only connect to the front belt, not from side. This is to fix internal problems related to modded loaders with custom sizes and side loading of it.
- Implemented NoiseExpressions::fromPropertyTree for the "offset-points" noise expression function.
- Removed rocket silo rocket prototype property "result_items" because it did nothing.
- Added draw_as_light and draw_as_glow property to sprite definitions. draw_as_shadow, draw_as_light and draw_as_glow are mutually exclusive and draw_as_shadow takes precedence.
- Unified laser and beam related ammo categories to just "laser" and "beam".
- Renamed technology "laser-turret-speed"->"laser-shooting-speed", it now affects both robots and laser turrets.
- Renamed technology "turrets"->"gun-turret", "laser-turrets"->"laser-turret", "combat-robotics"->"defender", "combat-robotics-2"->"distractor", "combat-robotics-3"->"destroyer", "tanks"->"tank", "stone-walls"->"stone-wall", "gates"->"gate"
- Internal spidertron specification in a way to make torso and leg scaling much easier.
- Renamed "source_effects" property of line trigger item to "range_effects", due to ambiguity with source_effects on action delivery. (90591)
- Added the "linked-container" entity type.
- Removed 'small-plane', 'computer', 'railgun-dart' and 'railgun' items.
- Removed 'bait-chest', 'crash-site-assembling-machine-1-broken', 'crash-site-assembling-machine-1-repaired', 'crash-site-assembling-machine-2-broken', 'crash-site-assembling-machine-2-repaired', 'crash-site-electric-pole', 'crash-site-generator', 'crash-site-lab-broken' and 'crash-site-lab-repaired' entities.
- Removed the "auto-character-logistic-trash-slots" modifier and forceDataValues. The auto trash are now always enabled when any trash slots present.
- Added direction to SimpleEntityWithOwner and SimpleEntityWithForce.
- Constrained collision_box and collision_mask of transport belt connectable prototypes so it is not possible to build the entities in overlapping positions. (82294)
- Added optional draw_fluid_icon_override boolean to pipe to ground prototypes. Causes fluid icon to be drawn, ignoring the usual pair requirement.
- Removed fluid turret prototype property 'indicator_light'.
- Added fluid turret prototype properties 'enough_fuel_indicator_light' and 'not_enough_fuel_indicator_light'.
- Added locomotive and car prototype properties 'front_light_pictures' and 'darkness_to_render_light_animation'.
- Renamed logistic-container prototype property 'logistic_slots_count' to 'max_logistic_slots'.
- The data stage files are no longer divided into demo and non-demo. This means the files with the demo- prefix were either merged into files without the prefix and/or the prefix was removed from the file name.
- Renamed the clean_cursor method to clear_cursor.
- Renamed on_put_item to on_pre_build, as it is much more precise name for that event. It fires when anything is used for building: item, blueprint, blueprint record or ghost cursor.
- Changed 'control_behavior.parameters.parameters' to just 'control_behavior.parameters' for LuaDeciderCombinatorControlBehavior, LuaConstantCombinatorControlBehavior, and LuaArithmeticCombinatorControlBehavior.
- Changed LuaItemStack::active_index to return `nil` if the blueprint book inventory has zero slots. (88427)
- Changed LuaItemStack::count to return 0 instead of failing when the stack is empty.
- Changed LuaControl for players in cutscenes so the character is still usable.
- Changed on_player_cancelled_crafting 'cancel_count' to report the exact number of crafts cancelled.
- Decoupled deactivation by script and deactivation by circuit network.
- mod-gui.lua no longer defines 'mod_gui' as a global variable, it is now only available when required: local mod_gui = require("mod-gui")
- Made LuaEntity::speed read work with spider-vehicle.
- Made LuaEntityPrototype::guns read work for spider-vehicle.
- Removed LuaEntityPrototype::production read.
- Removed LuaBootstrap::is_game_in_debug_mode read.
- Added LuaEntityPrototype::max_energy_production read.
- Added LuaEntity::trains_limit read/write.
- Added LuaEntity::trains_count read.
- Added LuaTrainStopControlBehavior::trains_count_signal, trains_limit_signal, set_trains_limit and read_trains_count read/write.
- Added LuaEntity::tree_gray_stage_index, read/write.
- Added LuaEntity::tree_gray_stage_index_max read.
- Added LuaEntity::can_wires_reach().
- Added LuaEntity::crafting_queue_progress read.
- Added on_spider_command_completed event.
- Added LuaEntity::get_connected_rolling_stock().
- Added 'create_at_cursor' to LuaPlayer::create_local_flying_text().
- Added LuaGameScript::map_gen_presets read.
- Added LuaStyle::extra_margin_when_activated and extra_padding_when_activated write, which also accept arrays of values.
- Added LuaStyle::size write.
- Added LuaGuiElement::name write support.
- Added LuaGuiElement::tags read/write.
- Added LuaTile::to_be_deconstructed().
- Added LuaGuiElement::bring_to_front().
- Added 'has-rocket-launch-products' filter to ItemPrototypeFilters.
- Added support to save/load LuaProfilers. They simply reset the time when saved/loaded.
- Added LuaEntityPrototype::guns for artillery turrets and wagons.
- Added LuaEntity::combat_robot_owner read/write.
- Added LuaPlayer::clear_recipe_notifications and LuaPlayer::add_recipe_notification
- Added LuaGuiElement::add "index" property, allowing insertion to anywhere in the parent element.
- Added LuaGuiElement::get_index_in_parent().
- Added support to connect/disconnect power switches through LuaEntity::connect_neighbour/disconnect_neighbour.
- Added LuaForce::get_linked_inventory().
- Added LuaEntity::link_id read/write.
- Added LuaGui 'relative' (player.gui.relative). For showing a CustomGuiElement relative to some base game C++ GUI.
- Added LuaGuiElement::anchor read/write.
- Added 'alt_mode' to on_player_toggled_alt_mode event.
- Added 'cursor_position' to the custom input events.
- Added 'queued_count' to on_pre_player_crafted_item.
- Added LuaPlayer::cutscene_character read.