I wouldn't say there is something specific "supposed" to happen there. I could tell what I've experienced "there" in detail, but I don't do it because you could try to replay my experiences and this won't get you anywhere.

So, what could you do to perceive something more than only floating in blackness?
   Bruce tells of a "3-D blackness", which for him is a starting point for explorations, and I seem to see something similar, it's like outer space with distant, tiny dots, like stars. You might try to start gazing onto the blackness, maybe it becomes a gazing i n t o the blackness after a while; and then, you could try to make out any differences in this blackness, and when you find any little speck different to the surrounding, focus on it and try to see more, try to go there or "zoom" into it.
   You can ask for assistance for seeing more. You could, before the exercise, think about what you'd like to see, where you'd like to go, or what you'd like to do. This will trigger your imagination, and what often happens is, at first you feel like you're making something up, but then a "story" will unfold quite quickly which afterwards appears to be astonishing and unlikely to be a product of mere phantasy.

I found Focus21 to be a "place" from which, once familiar, you can go everywhere, to all the other, "higher" Focus Levels, even beyond Focus 27 without aid of HemiSync.

That you have complete dissociation from your body I think is something rare. I've never had that during regular meditations, only at sleep and other, exceptional states. My guess is, the more one can phase away from the physical body, the more immediately impressing nonphysical experiences can be, as one is more "into it", and the sensations are more vivid, more sensual. On the other hand, it could be that the more "out of body" one is, the more one has to deal with fears, due to the physical-reality-impression.

Spooky