What this announcement shows, is that players like Roku need to be VERY afraid.
Say all you want about the fact that the new Apple TV specs wise is ho hum (and I'd agree with you), but the fact of the matter is that all those people who are familiar with Xcode development and the IOS APIs now can develop for tvOS.
What that means is that in a VERY short amount of time the number of apps will go from zero to crazy in no time at all. Roku has struggled for a LONG time to get a good set of apps for people to use. There are hardly that many games for Roku (the major ones though like Angry Birds are there) and everything else are screensavers, streaming channels or Church apps (for the most part).
Say what you want about how the Apple TV sucks, the fact that millions of Xcode developers for IOS can develop for it means it will pretty much sink companies like Roku.