I think Sky will be stronger. They have been investing sensibly in powerful climbing domestiques who can also TT. Kiriyenka is a direct (and fine) replacement for Rodgers. Flecha is one of my favourite riders but he's probably never going to win a classic again, and that was his main intended role at Sky. Eisel has already taken over his road captain job. And as people have already said, Uran and Henao are super-domestiques for the GTs as well as potential winners of any race with mountains. I'm not sure about Thomas; I hope he can do well, but I don't think he's as strong as some seen to think.
I just hope they have more competition from other teams (as teams, not just from individual riders), otherwise we are in for a less exciting season ahead.