What's the best way to install this with bower?
You should be able to specify this version as you do others in your bower.json.
1. Download (or point to) https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0rc1/ang...
2. You're done
The same goes for angular-resource, angular-cookie, angular-scenario, and the newly created angular-route. They are all versioned along side the main library, so use 1.2.x as the version for all of them.