Cool. Let's have it so people can choose GC at will. That way if one GC on a battlegroup wins often, everyone can switch to it at whim and increase the queues dramatically since no one else will be using the other GCs.
In most other MMOs with a PVP system, once you choose your faction, it is set in stone. Can't change, ever. Or if you can (rarely) change, there is severe penalty. At least they are giving you the option to change with next to no penalty.
