Whats the point of waiting? You might as well be playing with the thing!
Even if this new version is released, you can just sell your current model and upgrade if you really want to - you won't lose *that* much money.
I don't understand why people seem to think that a new version is suddenly going to make the current GP32 'rare' or worth less money - it still does exactly what it does at the moment, and they aren't about to start dissappearing in a puff of smoke!
The only reason it would be worth waiting would be if you could buy the current model for significantly less, half price or something. From the rumours going around, it doesn't sound that much of an improvement anyway, so don't hold your breath.
Get one as soon as you can - you won't regret it...