Today, when asking a T-Mobile rep about different plans, she initially mentioned this plan to me as, "Unlimited texts and E-mail" (no data).
She tried to add it to my plan, but couldn't find it again. She then saw a note that it was available only in Tampa, FL, and something-else, FL (Orlando, was it?) and apologized.
So as an update, this plan is still in the "testing" stages apparently.