Two bugs I've noticed in multiplayer that I haven't seen mentioned.
First, the new megastructures don't seem to 'count' for the purposes of the mega-engineering tech weight. Checked the scripted effects doc, and the flag for having a megastructure does not include any of the new ones (art,strat, etc).
Second, and I assume this is a bug, I had the option to trigger the end of the cycle in an MP game. To my great, great, unending shame I did not pick it. Looking at the shroud events file, I don't see any check for whether or not the game is MP, so for all I know this may be intentional. If so, that's pretty great.