This week my Nexus 7 came up with this notification:
I read about that Google launched 4.3, so i tapped on this notification and:
And this time Google provides some information about this release.
One really nice thing is, that with 4.3 it is possible to create restricted user accounts and you can grant these accounts access to specific apps, which you already installed. This is exact the thing you need, if you want to create accounts for your children without app store access and without creating them e-mail accounts....