Oh god, yeah. Amazon are the big unknown in all of this at the moment. I don't know if they've secured any day and date releases from anyone though. I'd be surprised if they have, but then Amazon can pay just about anything, so it's perfectly possible.
Amazon is interesting because of their huge reach (Prime userbase).
On their FireTV sticks they also have "prime channels" which are other streaming video services which can hook up into prime and you can subscribe to them for an additional fee.
As the UbiSoft channel shows they try to have the same system for the game streaming service. And while it makes not much sense for the video services, it might for the game streaming.
I would not be surprised if they offer a stripped down version of their game service free for all prime users, plus additional channels for a fee. If they do it right, they can get a large user base quickly and are attractive for 3rd parties to offer their channels, for example an EA Play Channel, an Square Enix channel or whatever. Maybe even a playstation channel in a few years?
Another concept: Here in Germany if you are a prime user and you buy a music CD you can also stream the songs for the CD via Amazon Prime. Just think if this would be possible for games.
One thing which differentiate Amazon from Google is, that Amazon knows how to sell stuff to the end user. And they have possibilities Google has not because of the existing user base and existing infrastructure.
While I personally do think that Game streaming is for me, I am interested to see Amazons how strategies will look like and how successful they will be.