Probably not, while they are working on it, that doesn't mean that they signed a contract to keep their characters exclusive to Super Smash Bros, heck, there's a chance that they are only working on the mechanics, and maybe ONE Tekken character will get in, if that
That don't mean anything. Namco will still probably offer reps if Superbot asks them. Besides the MAIN DEVELOPMENT TEAM of Tekken is working on SSB4, not all of Namco is working on it. Though I never played Tekken, has the Tekken series even been on a Nintendo Console before?