Some stuff got put out about the new set, mostly fluff, but we did get a few details about the upcoming set:

4 'walkers - two new ones Tyvar Kell and Niko Aris, with Kaya and Tibalt returning.
Snow mechanic is in.
The remaining 4 Pathways from Zendikar are in, and not snow.
Double Face Cards are here.
Lots of the art shown references Norse Mythology - things like Yggdrasil and runes on things.