1) GW/(r/u) Mavericks
2) UW Stoneblade
3) Show & Tell (non-Hive Mind)
Against the first 2, I can see including 1-2 Elspeth/Garruk Relenteless in the SB to gain an advantage. I like Garruk better right now because he has more useful abilities; but I'm not discounting how Elspeth can put away games fast. The reason for it is to out-muscle the tokens, extra removal, and tutoring power.
Secondly, I think that Choke is a known entity and many players are starting to pre-emptively answer that option for us. This is where we can start to play one step ahead.
Finally, taking a page from Standard,
Silhana Ledgewalker is starting to look REALLY attractive against UW blade decks.
Against the Show & Tell decks, we still run fairly well with KotR being able to tutor up Karakas. Sneak Attack is a bit trickier both for being able to haste out Emrakul as well as have option in Bloodmoon. I think Pithing Needle might be a decent catchall against the wide open metagame.