I received one of the first round developer units myself and started on a number of ideas, both to test the capabilities of it as well as the market. Because of my workload at the time, I missed the deadline to have something out on launch day. Sadly, that seems to have been a good thing -- I have read nothing positive about the reality of marketing for and producing on the tvOS App Store. Everything indicates it's even worse off for revenue prospects than the iPad app market, which, aside from games, is on a steady decline.
While I'm sure we'll never know, I'd love to know what Apple actually expected to happen with the opening of this new App Store given the state of its other ones.