As for the seeding in CL and the Italians in it, Inter are surely group holders, Milan are in pot 2 but they can be group holders if at least one of Arsenal and Bayern fail to pass the qualifications. Napoli will almost surely be in the last pot. Udinese, if they qualify, will probably be in pot 4, with chances to make pot 3 if three of some of the 7 teams better placed than them fail to pass the qualifications.
From the big teams: United, Barca, Chelsea, Real and Porto are certain in pot 1. City will be in pot 3 for sure. Lyon are pot 2 and they need a miracle to make pot 1 (Both Arsenal and Bayern mustn't qualify). Dortmund will most probably be in pot 4 but they might make pot 3 in the end.