If they keep the Palm compatibility and make a device which is physically capable of competing with the GBA gamewise, i'm sold. i too own a PDA (Clie NR70v) and while i'm happy with the PDA end of things, the selection of games isn't the greatest (puzzle games aside).
Honestly, i'd rather Nintendo release a PDA cartridge, like they did years ago with the original "brick" GB. i don't always need my PDA, but i don't want to have to make a choice between pure entertainment (GBA) and a multi-function device (PDA), because the PDA wins almost all the time.
i think for the most part, the age thing is pretty dead-on. i've seen more people in that age group with PDAs than Gameboys of any type. Outside of Nintendo fans (of any age) the Gameboy is thought of as something for kids, especially in the shadow of the Pokemon craze. And some jobs and universities offer incentives to buy PDAs; there's nothing i know of like that for GBAs in that age group.
Update: A quick visit to Tapwave's site reveals details on the device:
High-resolution 480 x 320 pixel screen, with portrait or landscape-mode display (3.8 inches diag. according to Palm Infocenter)
i.MX1™ Motorola® ARM9 Processor
Analog controller, integrated triggers and a full complement of action buttons
Unique ergo-centric design, weighing less than 6 ounces
All-inclusive gaming environment with the Fathammer X-Forgeâ„¢ 3D Game Engine
ATI® Imageon™ graphics accelerator
Yamaha audio component, stereo speakers and earbud-style headphones
Dual lithium batteries
Rumble effects
Full-featured digital music player
Built-in Bluetoothâ„¢ networking for multiplayer wireless gaming
High-score conduit for community competition
Also according to Palm Infocenter, the device won't have 3D hardware, but can do 3D graphics in software via the Fathammer API. For some screens of Fathammer-powered games, check
http://www.fathammer.com/games/games.shtml. Note that the shots on that site don't show Helix hardware, but it should be safe to assume that the Helix would look similiar to them, which would put it at least as capable as the GBA in terms of poly pushing, easily above. Of course, factors like framerate and resolution have yet to be announced.
As pretty much always the case, the hardware is interesting. Let's see the games.
i could be wrong, but the three-button motif on their site seems to suggest that it'll have three "action" buttons on the face. Just a thought.