To summarise, it seems that there will be some changes to the Paladin's spell list. Judging from the Blackguard's revised spell list, it seems likely that Eagle's Splendour (currently adds 1d4+1 to Charisma for 1 hour/level, may be changed) will be on it.
Piratecat also mentioned that Paladins get "at least one very interesting change". I haven't heard anything confirmed about that, but speculation is that the Paladin will get a Celestial Companion instead of a Bonded Mount.
I've heard that the multiclassing restriction will stay, though. We'll have to see how we can get around that.