Combined, the game will most definitely top the previous games in the series, and any other 8th gen fighter.
Smash Bros. is a huge, system-selling franchise. I'd expect GCN level sales for the Wii U version -- around 7 or 8 million -- and about 5 million for the 3DS version. There are going to be a lot of people who want both versions.
So my guess is roughly 12 million.










