I watched the final episode from Season 3 last night, and the first two new episodes. My observation was that the final "original" episode was fucking hysterical from start to finish, with the Pete Rose horn cuts, Maeby's "there's a girl in my soup!" card, "shoveling coal" and so on. Good god the original series was funny, I had forgotten in the couple years since I watched it. First two new episodes were very, very flat to me, but understandable given they have to bang out a lot of story/catching up in a very short time. But really, I can't think of anything that stood out to me as being overly amusing from them.
So I hope everyone's right and that it seriously picks up steam!