We can but hope. No offense to Pichu's fans (if there are any), but he honestly felt like a wasted character spot in Melee, a spot that could have gone to someone else. However, this doesn't deconfirm Pichu, it only knocks his chances. Also, my theory that he appears in the background of the electric mode of Pokemon Stadium 2 seems to have been disproved, so we'll have to wait and see what becomes of Pichu...
EDIT: @lukintosh: Meta's voice can be heard clearly at the end of two vids, the 'Diddy's Final Smash' vid and the vid showing the return of Sudden Death, both found in the first post of this topic...