Phoenix decks look really fun right now. I'm a little wary of being stonewalled by Bant Spirits, but otherwise I think this deck seems like a more midrangey version of Burn that can go for a longer gameplan. Also destroys Tron, which is a matchup I hate losing to after >1 year of GBx.
Spirits looks to be the new flavour of the month (or maybe just behind? Bird site makes it seem like Amulet Titan is picking up, but this might be exaggerated). Popularity aside, this seems to be the best way to go in pursuit of 'fair' Magic in Modern. The only pieces I currently have in paper are the more expensive core bits, the Spirits themselves aren't really played outside of this deck which worries me a bit.