Hi Michelle!
The Magic Bands are exciting, aren't they??
Unfortunately, I don't have any concrete details on the Magic Bands and
when they will roll out to different resorts. However, they are
scheduled to roll out through the rest of 2013.
If you haven't had the option to customize them by the time you leave for your trip (check in the My Disney Experience application), be sure to inquire at check-in. It never hurts to ask!
You may also want to keep an eye on the
Disney Parks Blog.
They have released some details on the the entire My Disney Experience
and Magic Bands and I'm sure they'll be the first to have the scoop as
to their official launch date.
Sorry I couldn't have been more of a help!