I actually think we should wait before we actually start brewing, at least 1 or 2 months, I am very positive that a LOT will change in the coming weeks. I have my Leviathan decks ready to play WoTC format :), but they are not strong enough to face what has been unleashed in WoTC 1v1 Commander, I will probably be playing Baral that I have for the time being and hope I can actually play my other decks in the future: Sidisi, Selvala, Mizzix and yeah Slivers xD.
I don't think the 1 vs 1 Traditional Commander forum fits it either because it's filled with years of Sol Ring theory there
http://wizardsmtgo.tumblr.com/post/160343614814/update-mtgo-commander