Given the number products and services that Google has shuttered over the years and their focus on learning all there is about their users, I am going to sit this one out.
There is definitely some cool work here though: being able to have access to a library of games without lugging around a console or computer is an interesting idea with both pros and cons. The pro that I can think of is not having to be responsible for upgrades. The con is that we continue to move towards a world where we rent more and own less.