So rumours and very recent information seems to suggest that Ryu is going to be revealed as a DLC Smash 4 character tomorrow.
And some speculate that Nintendo would only allow this if Ryu was set to feature in another Nintendo-console game soon. But we know that Street Fighter 5 is Sony-exclusive (console-wise, not counting arcade and possibly PC), so it won't be that.
So what Capcom fighter (or alternative Ryu-featuring game) could such a title be?
Some obvious possibilities are in the attached poll. Some of them cover multiple possibilities... please post the extra details in such a case.