Basically you can delete arena teams and aslong as you ask within 3 days you can get your arena team back from a GM.
So S4 is coming out on the 28th (?) I believe.
All you got to do is delete your team on the 27th (?)
Wait till S4 is out. Open a ticket. "I was tricked into deleting my arena team".
GM gives you back your old team. With old rating.
Less work to be done = Profit
I DO NOT KNOW IF YOU WILL HAVE PREVIOUS PERSONNAL RATING BUT WINS WILL GIVE MORE PERSONNAL RATING ANYWAYS =)
have fun
Its what Shleven is pm'ing people but with more info about it and less 'theory'