I don’t think it would affect Corona Cloud in that, if I understand it correctly, Corona Cloud offers leaderboards, etc., for the app across all devices (i.e., iOS, Android, Kindle and Nook), while Google is offering leaderboards, etc. for Android devices only, just like Apple offers them for iOS devices only.
Anyhow, I can’t wait for Google to offer these features and Corona to offer us plugin or added them to the core!
Naomi
Edit: Actually, I think it’s a significant plus for Corona Cloud if Corona Cloud can bridge Android users and iOS users, allowing them to chat, play against each other, etc.