FastBikerBoy
Nothing has changed. If I "Save as'd" in earlier versions I was in the new project. That's the same behaviour now for that command, "Save copy as.." has added to the save possibilities by leaving you working in the current project having just saved a new one.
I don't get it. Before writing the above, I first retried it out to make sure. On my X3eP, and I'm pretty sure my previous X2aP, if I Save As, I remain in the original project - while a copy with the new name is indeed created in the background.
Either that, or the window title doesn't get updated, but that would be problematic as you wouldn't know where you were.