I know what's available- I have one myself, I just don't ever use it. I don't have a Hulu Plus subscription, nor do I buy music/video through the Play Store. Chrome tab performance is weak at best.
I guess I'm just hoping for a lot more than what I have right now.
That's the reason to be excited about the SDK release, but honestly, regardless of the number of apps even available, I just don't use that many services that I want to stream to my TV. The current crop does pretty well. I would like to see the ability to throw a Flash object to the screen so I can play any embedded video, and I hope to see interesting games and ambient apps, but that's about the extent I can think of.
Chrome tab performance may be weak due to a slow router. I bought a newer Asus and it helped quite a lot. I can play youtube videos within a Chrome tab and it works perfectly well, even with the router several bedrooms away.
I guess I'm just hoping for a lot more than what I have right now.