Trivia: The pilot is dedicated to the memory of famous comedy filmmaker John Hughes, who had recently passed away. Hughes' films, such as "The Breakfast Club" and "Sixteen Candles", were big inspirations on the series and creator Dan Harmon.
Trivia: Troy says he's Jehovah's Witness. In real life, actor Donald Glover was raised as a Jehovah's Witness. Annie says she's Jewish. In real life, actress Allison Brie's mother is Jewish, making her Jewish as well.
Trivia: When Shirley is the Captain in their sailing class, the collar device on her lapel is two silver bars. While that is the collar device of an Army Captain (O-3), it is only a Lieutenant in the Navy. A Navy Captain is an O-6 and wears a silver spread-eagle on their collar device.
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