At this point, the only known things left to do before a release is possible (besides some further testing, maybe) are:
Player
Some performance improvements for the level select screen
Editor
Adding support for object rotation
Adding support for obtaining graphic sets from the online server
Possibly implementing some of the smaller, easier-to-do suggestions
Flexi
no further work needed
GSTool
no further work needed
Since we're so close, I'd like to encourage everyone to try out these new versions and let me know of any issues you find / suggestions I've missed (feel free to mention them even if you mentioned them before, I may have forgotten; even if not, the worst that can happen is that I say "I don't plan to implement that" or "I'll do that eventually but not for this release"). Chances are very little is going to change between the current EXP versions and the eventual stable releases.