There is plenty of talk on the forums about building more than 1 building or ship per turn with overproduction. Most likely, it wont change. I'm 50/50 on the matter.
However for TECH, your extra research DOES CARRY OVER. Always select the next tech up the tree, as excess tech points will carry forward. However, the pain with this is when you hit a specialization branch. By default, all tech points carried over go to the TOP one (miniaturization is always on the bottom), which can be a pain. Not sure if this is intended, but in late game, if you are racing for a tech victory or just trying to catch up in a branch you never researched, you can research well more than 1 tech a turn. I've researched 4 in one turn before. This is because in late game you have A LOT of research points, and early tech is very low cost in comparison to high end tech.
