Jeff Winger: Have you learned nothing from your insipid Twilight books? Men are monsters who crave young flesh.
Cooperative Calligraphy - S2-E8
Shirley Bennett: Uh, Jeff, you don't have a bag?
Jeff Winger: Oh, I could never deprive the world of a portion of my chest the strap would cover.
Jeff Winger: Greendale may be a toilet, but it's our toilet, and nobody craps in it but us.
Messianic Myths and Ancient Peoples - S2-E5
Abed: I used to think all Jesus did was walk on water and tell people not to get abortions, but now I see he's so much more than that. He's like E.T., Edward Scissorhands, and Marty McFly combined.
Answer: The implication is that Jeff will still be teaching at Greendale after Annie and Abed leave. As for who became vice dean? It's never shown, since it's not really important to the series.
TedStixon