When I first saw the question my gut immediately said that it would like to keep the Mane Six, through and through. But now I'm realizing that realistically speaking, what usually happens during a reboot of a show is a completely new idea. Why would the creators go announce an entirely new generation just to be displaying the same stuff, the only change being the new animation? I guess what I'm feeling is that I don't want G4 to leave because I've fallen so in love with it. So I say all or nothing. If they plan on doing a new generation, I'd be interested in seeing more light being shone on the CMC's and perhaps the friends they make as the new "Mane Six;" I wouldn't want completely new ponies being created just for the sake of a "clean slate." I just hope that the show keeps the down-to-Earth and real qualities in the characters, new or not, and doesn't evolve (or in this case devolve) to please exclusively the younger audience, rather the whole spectrum or fans as it does so beautifully now.