I wouldn't hold your breathe. This is the Top of the Line for Apple made displays right now. A few months ago there was a rumor of Apple working on a 30", but I can't even render a guess at what that will cost.
Just go for the 23", make the rest of us supremely jealous, and be happy. If you don't like it, get the 30" if/when it comes out, and go ahead and give me the 23"....
See, that's the kind of guy I am...I am willing to help you out by taking that worthless 23" godsend off your hands so you can be happier. Damn I'm a nice guy!
Good luck whatever you decide.
Later,
Vard