Personally, I expect to see a lot of trap decks out there. Also I think that meta game will (at some point) turns toward counter-picking anything the top-rank players choose.

Well, of course that tactics will change depending on each player's availability. Players with long AFK times will likely stick to trap decks or something like that, while more active players (with strong enough cards) will likely stick to offensive decks to get better results from their on-line times, only switching to traps when going AFK.

That's my guess based on what I've read so far.