On an Italian gaming site they have a list of all the games being previewed at E3
and guess what... among the games was GTA San Andreas.
Amongst other games that you may be interested in are:
Call of Duty: Finest Hour
True Crime II
Gran Turismo 4
The Getaway 2
So we have a nice array of games to look forward too, i think the most anticipated is obviously San Andreas
If you look through Take 2's list of games you will also notice 'Grand Theft Auto' for Gameboy Advance
ok... well do you want to say why it wont be fun?
I myself dont see how they can physically make it for GBA, if they do the graphics will be really crappy and the gameplay wont be very good at all and with such a small screen you wont be able to see anything so it seems pointless to me