I'm very sorry that LTE expansion in your area is taking so long. I completely understand your frustration and want to thank you for your patience. AT&T's top priority is delivering the best network to as many customers as possible. We don't have an exact date, but given the proximity of the other LTE areas, the wait shouldn't be much longer.
You can also download and install our free Mark the Spot app to let AT&T know where network improvements are needed.