Multiplayer behind a DS-Lite connection is work. If you are hosting you just have to make sure everybody joining has ipv6 connectivity. Joining non public ipv4 only dedicated servers is also working as is joining game of somebody with ipv4 only connectifity and opened ports. Not sure if joining publ...

This seems to be an issue between Linux and Windows or 32 bit and 64 bit. Between a 64 bit Linux client and a 32 bit Windows client building a blueprint item or a deconstruction blueprint item will get you in a desync loop. Between two 32 bit Windows clients on the same map it seems to work. Edit: O...

I just wanted to add that i would love to see IPv6 support added.
Not all ISPs give you your own IPv4 adress anymore and so you can't host games and if you are unlucky and both of you are behind a carrier NAT it doesn't work at all. Only when doing lots of other stuff like vpn etc.