Philosophy

Databases are specializing - the "one size fits all" approach no longer applies.
By reducing transactional semantics the db provides, one can still solve an interesting set of problems where performance is very important, and horizontal scaling then becomes easier.
The document data model is easy to code to, easy to manage (schemaless), and yields excellent performance by grouping relevant data together internally.
A non-relational approach is the best path to database solutions which scale to many machines.
While there is an opportunity to relax certain capabilities for better performance, there is also a need for deeper functionality than that provided by pure key/value stores.
Database technology should run anywhere, being available both for running on your own servers or VMs, and also as a cloud pay-for-what-you-use service.

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