I'm a bit skeptical of it, it doesn't look like it has the same feel as the Mario Partys on the N64 and Gamecube. Don't get me wrong, I love Mario Party, but I'm not sure how the GBA version will be, it looks more single player oriented, which of course defies what Mario Party is based on, but if the Minigames are good, then I guess it should be alot of fun.
Personally, I'm hoping for a DS version which is either a port of or has the same feel of the N64/GCN ones and makes use of the wireless multiplayer for sure.