Here's what I was able to dig up for you:
I'd be interested to learn a little more about what you're trying to do that you want the transparency and the OpenGL context.
Hope this helps.
1. overlaying the map on other content. for iOS, wouldn't this work:
view.opaque = NO;
view.backgroundColor = [UIColor clearColor];
and then in the gl render code:
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
2. not really needed, just asking
3. cool, thanks. is this available in beta1 right now?
when is beta2 going to be released?