I agree! They will not reveal it now, only keep us happy with the NDS until they give us something even greater. Like I said above, the next GameBoy will indeed be a revolution! But I think we should not speculate about it, only expect that we will be very happy when it hits the market. As much as Nintendo make efforts to create ultimate gameplay experiences, there is no doubt in my mind that we will be! Also, the next GameBoy comes after the PSP, which gives Nintendo the advantage of the hardware performance. But I really haven´t any clue as to what they will then give us, only that it will be something we have never seen before.
The PSP is like a huge wedge that Nintendo has put inbetween it´s own GameBoy market and the anticipated PSP market, to secure it´s own position by demonstrating to the world what it can give for pure gameplay! When I saw E3 demo´s of the PSP hardware and software, I yawned! It´s cool enough no doubt, but funfactor-wise it´s nothing more, well, than what they also call it themselves: PlayStation Portable (PSP). It will have it´s audience and marketshare, but people will defintely be interested at least as much, if not more, in the new possibilities that the NDS offers them...