I’m interested and will keep my eye on Tizen, but as of September 2011 I don’t see any published licensing information (other than Linux’s GPLv2). On good faith, I don’t think this will be an issue upon first release. However, is Tizen going to evolve as “open” like Android or pursue some street cred with those who value free software?
Even if a tease, I certainly applaud the idea of an API for “HTML5 and other web standards”. For various popular phone operating systems of the day, these “App Stores” are an ugly regression.