For some reason Powered Up didn't sell well, so Capcom is reluctant to make a sequel to this OR Maverick Hunter X. It's a shame..
It really is. I think they didn't sell well because of the platform they were developed for (since it wasn't popular at the time).
Too bad, since both of them are great games. MHX wins for remake value and for the FMV's, while MMPU wins because of its sheer replay value (that you can play as any robot throughout the game, in three modes, and find construction, enemy, and background 'packs' for Construction Mode is replay value galore).