lol, I'm sure just to torture us, they'll end the episode at this very second of the kiss! She'll ''say something'' the following week! LOL
As for the Sylar case, why he don't remember, I have a theory (I always do! lol). I just think that when this mercenary shot Natha/Sylar last week, it ''removed'' Nathan from this body, but didn't brought Sylar back in it. Sylar's mind is still in Matt! So without Nathan's memory nor Sylar's ones, well, he just has amnesia!