Looking at the pictures, I know notice that the Big Bird has eye lids.
Here and at Tough Pigs, people say that this is the revealed series 2, as if it's new news, but I thought we had always known that'd be the line-up. When the line-up was announced, I believe all of series 1 and 2 were announced (even if it wasn't clear that some would be in series 1 and others in series 2).
Here's what I think would make a good series 3 and 4 line-up:
Series 3:
Abby Cadabby
Zoe
Rosita
Telly Monster
Baby Bear
(this one would make a good "last series", it'd almost complete the current main cast, though I can see them wanting to exclude at least one girl character, and not sure how much of a desire Funko has for characters who aren't "old school"; while nobody more obscure than Snuffy has been released or announced, nobody from the 1980s and later except for Elmo has been announced).
Series 4:
Murray Monster
Prairie Dawn
Guy Smiley
Mr. Johnson
Segi (or maybe Roosevelt Franklin or The Amazing Mumford)