As you probably know by now the Houston page on American Girls' website has been open/working for a few weeks... The first day I saw it working I went to make dining reservations online and the fist available date is September 15th 2012!!! So as of know there is a great possibility that the store will open on that day.
Here is an image I found on Mattel's website
of what the Houston Store will look like:
Here is also one of the Miami store:
