It will extend the range, or at least the penetration indoors, thanks to the 800 MHz rollouts. However, for call versions, that's a little ways away due to our presence in the DMZ with Canada. It is coming - if you look at the sponsor map you can see a couple of towers in the area with 800 launched. Just likely after they get through the 3G/4G initial rollouts around here. Only then will you see a difference in coverage. In the meantime, once 4G launches, you should notice better speeds on both 3G and 4G, when you're connected to those towers. Until 4G launches, you might notice minimal changes, but nothing significant until backhaul's in place.
Once ALL of that's done, we can start talking about a potential 800 MHz rollout of LTE, but that'll be somewhat tough in this area due to emergency personnel being slow to move off of those frequencies. Additionally, then you'll start seeing the B41 LTE, for super-fast stuff where you can get it - but that's likely not until end of year at this point at earliest.