I think most likely these will come out anyway so why not speculate and offer ideas. Besides speculating can be fun.
You're right. Sorry to have jumped on the post the way I did.
To make a more constructing (and on-topic) response, I agree with the previous suggestion that githyanki would be the natural race to see here, or perhaps a more fully developed bladeling.
An astral raider type PC could be good too.
Actually, thinking about it, I think something that might work would be some sort of class that really is designed for campaigns starting at paragon tier. After all, astral sea and elemental chaos are not really heroic tier material. Perhaps something that allows a simpler entry point for starting a character at level 11, allowing the player a better chance to get the feel for his or her character. Rather than having a Paragon Path, its just a class that starts at level 11 and then moves onto the Epic Destiny. I've often found that when campaigns try to start at higher levels it invariably causes problems for the first few sessions as the players try to figure out what their characters can really do.
Mind you, I'm not sure what kind of class this would be, but I think most of the ones mentioned might fit in here. Certainly an Astral Raider would make sense for instance.