Here are some theories about the show (and would like to see people contribute more theories) about the new series:
1. The new kids end up in a situation similar to a situation the old gang ended up in, in their day. Like the time the gang thought they could get rich from a Spaghetti Sauce recipe from Screech's grandmother, only to learn it was from one of Betty Crocker's cook books and Screech was targeted by a gold digger.
2. A possible chance of Slater and Jessie renewing their former romance into something more.
3. One of the new kids (like one of the girls) dating a guy with less then worthy intentions and gets heartbroken, and Kelly recounts the story of when she broke up with Zack for Jeff Hunter, her boss from the Max and dated him for a time, only to end up heartbroken, embarrassed and humiliated when he cheated on her. Or Jeff will be referenced or appear and will still be the same sleaze he was in the old series or became a better person.
4. Screech will appear and could be revealed to be Mac's Godfather.
5. There will be implications of romance between Mac and Daisy, before the two end up dating and became the new Zack and Kelly.
Contribute your own theories about the series so far.