The new upgrade will fix several issues including multiple camera problems, model loading, sticky collision with BSP, some problems with transparency and much more.
(From The Game Creators Newsletter)That kind of put me off :D
Anyway, take a peak at Nano, Techno, and Beta Blocker.
Those three are done with Blitz's current self, and they are all very nice. There's way more too.
If you want GL, there's a good variety of engines both in dev and finished that you can use. It would be nice if Blitz had more low level functions to make those things easier to do, but it doesn't.
Perhaps lack of an update is a good thing?? This way, we can do all those little hacks and things that we used to be afraid to do in case another update creeps up and renders them useless.