[Can't you migrate current version to newest or update step by step? I guess you have a lot of tasks to complete but web client or android client are promising idea. It all depends how many people just develop engine, probably not many I guess.
Actually, we've tried and wasted a lot of time on it (months). It led to nowhere because after almost two years there is still no stable version. Fortunately we've decided to go back to what's working and stayed at revision 412. Current Reloaded is even older because it's based on revision 391 if I remember correctly.
Migrating large game like Reloaded (currently: ~6.5MB scripts, ~1230 dialogue files and ~600 map files) to a new version would require huge effort, and then you don't know if you won't have to deal with some breaking changes again with the newer SDK version. Totally pointless as long as there is no stable SDK version.