Well, it says WEB applications, so presumably this is something that will run in a browser, which implies some flavour of Javascript.

Tangentially, I've been interested in this space for a while, and I have a few in-progress projects built on CouchDB. My aim was to offer the offline app for free and monetize through sync / sharing features. This would've mirrored my cost structure (hosting), so I thought it was a pretty fair way to monetize a product.