Not my call. I'm just a lowly peon...
I will say this, though: even after several years of working on this thing, I can still get excited about it, and as we move closer and closer to the finishing line, the excitement is building.
Hang in there, people. You'll get your chance, and a lot sooner than you think.
if you guys are releasing preview code - does this mean the ai work has finished and youre just tidying up?
Nothing to do with me; we're going full-tilt on all fronts at the moment, because every member of the team can see the end of the road.
Long-distance runners talk about "hitting the wall"; we've hit dozens of them over the past several years, and every time we've smashed them down and pushed through. That's one of the things that has impressed me the most with this effort: not the amount of knowledge and expertise people have brought to the table (although it's ginourmous) but the perseverance.
We are all dreams of the Giant Space Butterfly.