In an interview Yoshinori Ono of Capcom was asked if Street Fighter x Tekken was coming to the 3DS. This is what he said in response:
It’s possible. For the 3DS, I wanted to do an [Super Street Fighter IV:] Arcade Edition version, but I haven’t had a chance to do that because of all the other things I’m up to. At the company, we’re debating should we go for an AE port on 3DS? Should we skip that and go straight to Street Fighter x Tekken? There are a lot of things up in the air, so I can’t say for sure what our next 3DS project will be.
We’ve heard talk of Street Fighter x Tekken before possibly coming to the handheld and personally, I think that’d be a more interesting title to have compared to the Arcade Edition. What do you think?