They are slowly bringing it to other tablets and other versions of Andorid. Its their App, and their Timetable.
In a way this is good. It means they care enough to actually test stuff before shoveling it out the door.
Of course the cynical side suggests some manufacturers of tablets helped them with some technical issues and demanded a little period of exclusivity. Could have been that way, but I doubt it. They are adding devices slowly.
Had to wait something like 3 months before it was added to The Boxee Box. Boxee would submit their app to Netflix & Netflix would keep shoving it back. All has to do with security as the way Netflix sees it.
the best things come to those who wait. just be paitiant if they just got the app out fast as they can you would be here complaining about how crappy the app is just like people with ipad haha suckers.