Thanks for the reply. The cat is only 9 months old so we're seeing plenty of personality changes. I think you may be right on the 'looking at something else' part... I think he's spending more time on the look out for our other cat, and his litter mate. They're both fixed, but I think they're starting to play a bit with dominance. I know it's not that he's not feeling well..he still runs, plays, and eats just like normal. It's been a few days since I've seen them laying together though... I do have a concern it may have something to do with that. Our other cat has recently started spending time in the closet next to the litter box... he comes out when we come see him, and he plays and acts very normal and happy otherwise. At first (and still partially so) I thought he was just scared of the other one and was hiding... but he'll come out and be around the other one without showing any issues at all, it just won't last long.
Oh and btw- I've been careful to make sure they are eating and using the litter box without any oddities or issues...again...all else seems good.