Very excited about the release. Schemas are something that ODBC connectors are doing already, although they are essentially normalising the collections into tables, sometimes looks ugly, but I suppose the aim's mostly to plug that into BI tools like Qlik, Tableau and friends.<p>I'm excited about the improvements that are being made in the Aggregation Framework, $lookup sounds interesting too, and hopefully it lands in 3.1.6 so we can start trying it out. For me the key takeaway from interacting with the MongoDB team on what's on the pipeline, it's been that I should invest more on the Agg Framework for some of my more complex workloads.<p>WiredTiger will be the default from what I heard, I've seen that the TokuTek people have slowed down with TokuMX and are building their own pluggable store into MongoDB.
Support of "read committed" is another big improvement coming in 3.2: <a href="https://jira.mongodb.org/browse/SERVER-18022" rel="nofollow">https://jira.mongodb.org/browse/SERVER-18022</a>