I think you are mixing something up here. They (CBS) never said that the special features would be mind-blowing, they didn't really say much, they only revealed the extended cut after Melinda Snodgrass and Robert Meyer Burnett had tweeted about it.
FrontierTrek knew about the full extend of the special features, teased a little and shared his enthusiasm (which I share as well). That might have led to people expecting more and more. That and Robert Meyer Burnett's twitter teasing ;-)
That explaines it then.
With regard to the Season 3 Trailer, I suspect it's on there. They always have a trailer on the first disc of a set.