This is fantastic. This is why I always appreciated Disney Movies Anywhere - one code, all services. I have used a bunch of Vudu's Disc to Digital conversions, and now they're (mostly) in my Google AND Amazon libraries. This is really fantastic. I hope all the studios get on board.
Also, one great feature of DMA that is carrying over to MA - Extra features. If you use MA, and look at a movie, you will see featurettes, deleted scenes, etc that would usually be lost if viewing through a provider service. Disney/Pixar movies always had that through the DMA service.