Interesting new database. Will likely take a while before it's useful for the kind of production situation that they are targeting, but it looks promising.
Meh, after using Mongo for a while, I'm starting to think that the best choice of tech is the one that you know best and that is most mature.
Picking technologies by hype doesn't seem to work out very well in the end.
I'm tempted to pick Postgres for my next projects.