If Taco Bell is joining the Apple Pay party, then KFC should be included as they are co-owned.
I've already used it at two KFCs, so I don't think they were blocking it - they both had the Ingenico terminals instead of the Verifone ones popping up at a lot of Taco Bells.
Also, regarding Pizza Hut - the ones near me have the little Verifone terminal behind the counter, so I suspect it should work, but may be too much work for people to do that.