None that I can think of. I'm pretty sure 2 is gonna be complete before 1.5 actually, because the guy who's inserting the tiles for it is working alone while everyone else is working on 2. While it is true all of the scripting for 1.5 is complete and everything, but it must take a really long process to insert new tiles for every part of the game. So really, the release is all on the tile inserter's pace and whether he's busy or not.