Eeee-yeeeeeeewwww. That's GROSS. And honestly, this can't be Uatu. He's a Stan and Jack character, for cryin' out loud - they wouldn't dare bump him off. He's featured in too many storylines over the years, and he's too familiar to fans. If they DID kill him, they'd do it in some sort of spectacular fashion - he wouldn't just be discovered dead like this. My guess is that this is some other Watcher, and that Uatu is just hiding someplace, and will pop up in a month or two going 'No, it's really me! That corpse was my cousin Ergatu. Fooled ya, huh? Oh, by the way, there's some really really big crossover-necessitating evil approaching Earth, and while I really shouldn't be telling you about it, I just can't resist the temptation to watch all you little guys panic down here.'