Cook, Bell, Pietersen, Prior, Broad and Anderson stay from the old guard to give some continuity and Root, Ballance and Stokes have shown enough to stick with. Take your pick then from a dozen or so to fill the squad, it would be Finn plus a spinner if I had my way, but who knows.
Everybody at Somerset, absolutely everybody. Buttler has moved Counties because he wasn't the best 'keeper at Somerset, and he's managed to average a massive 31 playing as a specialist batsman. It's a patently ridiculous to suggest that Buttler is ready for Test cricket, as is the witch hunt against Prior. The SMB cricket forum is weird parallel universe where people make up stuff about players like Pietersen and Prior and pass them off as fact.