Grove Street is back, so are the fams, its the "old" (previois gen) characters you wont be seeing, but Grove Street is in the game....Grove Street Fams are in the game, how can the gang be in the game but not the Street they name themselves after? Think people, please.
Theres even screenshots where you can see the word "Grove" sprayed on the wall in green spray paint.
I just don't feel such circumstantial evidence is enough to definitively say that they are back. Don't get me wrong, I like GSF and if they do end up crossing over into the GTA4/5 Era, awesome. But I remain unconvinced at the moment. We'll just have to agree to disagree for now and wait until mid-September to find out for sure.