I think every new store is going to be the new concept according to this article. Relevant quote:

“We never intended not to open it,” said 7-Eleven Stores President and CEO Jim Brown. “As far as the store itself, the timing wasn't good. We lost that store when we were in the middle of a project to design this new prototype, and we had already drawn the line and decided that we were not going to build anymore of the older style stores.”