Street Fighter X Tekken will be getting a free balance update at the end of the year, just like SSIV AE did last year. The update is due in December, and Capcom has detailed some of the changes coming to SFxT "v2013."
A post on the Capcom Unity blog details the changes, all of which seem to be buffs in the form of factors like increased distance, new chaining options, and increased damage. The post does say that more details are to come, though, so we would expect a few moves to be nerfed as well.
The blog also notes that new swap costumes will be available for 50% off for two weeks, and notes that the Vita version already has the PS3's alternate costumes. It's due on October 23, and the blog shared a new "Features" trailer for it.
Steve Watts posted a new article, Street Fighter X Tekken v2013 coming in December.
Street Fighter X Tekken will get a large "v2013" balance update in December.
The FGC has pretty much abandoned this game, so the patch will have to be pretty amazing to get their attention again.
The only thing that will get people interested is an option to turn off gems. It's a stupid money-grab system and it has pretty much doomed the game.