Even better news - it's free. Presumably, there are in-app purchases or ads, but we'll figure that out once we give it a go.
Update: No ads so far, but you can purchase coins for $0.99 or more (see the last screenshot below).
In the meantime, why don't you do that as well? I'll see you back here in a few hours. Or days. I won't judge.
Just remember to register for Google I/O in the morning, if you're thinking of going - don't forget, registration starts 7 a.m. Pacific time sharp.