what i've noticed so far:
the player is not able to leave an express transport belt when moving in 2 dimensions (e.g. x/-y ; -y/x) and stutters shortly when leaving a fast transport belt when moving in 2 dimensions.
moving in one dimension doenst cause problems
the "research progression meter" covers the "FPS" and "UPS" meter (resolution 1920x1080). unfortunate position
"God controller (mode without a player)" how to enable that? Edit: ok i found it. but its quite hidden in the "custom scenario"

the new gui looks cool! apart from the already mentioned "grey in grey crafting progression"
additionaly i found it quite hard to detect the resource outputs at the electric mining drill