User blog comment:David eric/Characters that probably will get cut from Super Smash Bros for Wii U & 3DS/@comment-5825070-20140524012023/@comment-25051557-20140526164719

they seem to like keeping the retro characters. they add 2 each game and have kept them ever since:

Melee: G+W and Ice Climbers Brawl: Pit and ROB WiiU: Little Mac and Megaman

Pit's already been confirmed so it wouldn't surprise me if G+W, rob and iceclimbers returned too