I have faith in ND, they never disappointed me so far. ;-).
Do some research on Fortune Hunters Club.
TL;DR: Promised 4 Map packs , first 2 were Uncharted 2 reskinned ,"3rd" was a co-op mission and 4th actually gave ppl a map pack.
oh also , They said there wouldnt be SP DLC and there wouldnt be a season pass.
Arne never said that there wouldn't be any SP DLC, he stated that chances of it were low due to SP DLC ideas in the past being spun into full game ideas whenever they tried to di it in the past.
As for the Season Pass, I guess we can track down and beat up whoever gave Eric the idea in blog comments.