You've got a team of cracker jack developers who introduce a product that, frankly, isn't ready for prime time by any sane person's definition with the goal of targeting the majority of developers (e.g., not the most experienced, and not the ones operating at the top end of scale), with no real mention of license?
I expected it to be a commercially licensed language, and honestly, was perfectly happy with that. This is of course better, but leaves me wondering just a little more what the business model is. Not that it's going to stop me toying with it -- I think Meteor is the best JS framework I've seen for ease of use.
As for the business model, I could possibly see them doing hosting. Although there's no shortage of node.js hosts, they could fine tune their service to work well with the Meteor framework and integrate it in a way that a generic node.js host wouldn't be.