(Note: all info is from the official Nintendo website)
The GameBoy Advance is a new version of GameBoy that will come out on June 11th of this year. They are even developing a game called Pokemon Advance that will be released (in Japan) in 2002. You can veiw a clip, or go to the official Nintendo website for more info, new screenshots, and news on the games. If you want to order a GameBoy Advance, go here. (It's where I pre ordered mine.) I was lucky and reserved one of the Game Boy Advances before they changed the shipping date for orders after April 27th to July 3rd!

Here are some screenshots:
  
  

Here are some specs:
|
Game Boy Advance |
Game Boy Color |
| CPU |
32-Bit ARM with embedded memory |
8-bit Z80 |
| Screen |
2.9" TFT reflective screen
240x160 resolution
40.8mm x 61.2mm screen size
32,768 possible colors
511 simultaneous colors in character mode; 32,768 simultaneous colors in bitmap mode
|
160x140 resolution
32,000 possible colors
56 simultaneous colors
|
| Size (mm) |
82mm(L) x 144.5(W) x 24.5mm (D) |
75w x 133h x 27d |
| Weight |
140g |
138g |
| Power |
2 AA batteries |
2 AA batteries |
| Battery Life |
15 hours |
10 hours |
| Software |
Cartridge format
Game Boy and Game Boy Color compatible
|
Cartridge format
Game Boy compatible
|
|