The thing you have to remember with Mourinho is although he is only 41 he is vastly experienced already besides what he has acheived with Porto the last couple of years he was manager of benfica before that i belive and Bobby Robson's assistant at porto/sporting lisbon and barcelona prior to that so i would be very surprised if the english game holds many real surprise's for him. i mean although his early managerial work has all been in mainland europe Bobby Robson would be a pretty good mentor i would think.
As for him having to work with a large squad etc etc its already been reported he wants no more than 21 out field players + goal keepers to work with and with all the effort + cash they have had to put into getting him i can see him getting his way. should make for an intersting season next year though