Google is considering selling movie titles through the Google Play store. Currently Google just rents movies out for now, but they have an interest in allowing Android users the option to buy the full movies.
One of the reasons why Google may be considering the switch is because Hollywood studios may have required Google to commit to selling the movies as a condition for getting access to the rentals.
One of the problems that Google has is that they do not have a way to transfer movies on mobile devices to a television set. Hollywood has been willing to make concessions for retail partners that want to push the sales of movies over rentals though.