Over-compensating for lack of updates probably, but there are only 2 tasks in the way of release now: Documentation, and compatibility functions (to aid porting from the old version)
I need to make a tweak so blendshapes/shapekeys can be exported from blender objects with generative modifiers (currently they just aren't exported if you have something like subsurf or mirror active), but that is lower priority, arguably a non-blocking nice-to-have thing, since shapekeys do export and function if you have no generative modifiers
I'm debating finishing and releasing the update within the next 10 days, OR jamming out a game to make sure it's production ready and then publish it at the end of october. I think for safety's sake I should do the production test, even though I'd love to get this upgraded and functional version out ASAP. I think I'd rather put out something well vetted and well documented that should hopefully last longer with more modern versions of GameMaker