I'm hoping that there is a new group of Guidos for next season.
The way I see it, Jersey Shore, as it stands, is a trilogy. Like the original Star Wars Trilogy.
Act One stands on its own. They could've ended both JS and SW after the first shots at it. Death Star is blown up, end of story. In Jersey, lots of drama happens, but by the end its all resolved and everyone becomes closer. Both end on a positive, conclusive note.
Act Two is much different. More meandering in both stories. There's stuff with Yoda, Lando, and Han & Leia that are really side stories to Luke and Vader. Meanwhile, I feel like, in Miami, "LetterGate" was the turning point, and the story becomes about the fallout of that incident, with some side meandering with Pauly and Vinny's love interests, Angelina leaving, and the various minor fights that break out. Also, Luke is left on his own and still has unresolved business with Vader, just as Sam is isolated and has unresolved issues with JWoww, Snooki, and pretty much everyone else.
So, I see Season 3 to end the story of this cast of Guidos. In the preview, it seems as though Sammi leaves, so that, I suppose, differs from Return of the Jedi, in that the underdog Luke fought back and succeeded, Sammi just gives up. However, I see the rest of season as a means to tie up the loose ends, and conclude the JS saga.
Also, with Deena here, we're one Ewok closer to turning it into Return of the Jedi.