1) The Professor River Song story seemed to be broken.
2) The trailers showed The Doctor punching someone.
3) The trailers showed The Doctor firing a pistol.
As of right now, all three of my concerns have been put to rest (though in truth #2 and #3 didn't worry me all that much.) I'm confident that The Doctor remains true to the overarching elements of his character, and that the River Song story has not only not been broken, it's going to rock the Tardis.
I'm also of the opinion that Stephen Moffat is going to succeed in turning the Weeping Angels into a returning Doctor Who villain worthy of upstaging the Master, the Daleks and the Cybermen (all of whom have been played pretty far past their shelf life, so upstaging shouldn't be a big trick.)
In short, I'm really, really happy with Season 5 thus far.