Ok so I've been following this post for quite some time, finally had something decent to add to the conversation so I broke down and signed up.
Spoke with customer service yesterday regarding lte. Although they told me there was nothing in the works in terms of LTE in my town, they did say there were 2 towers within 10 miles that were currently being upgraded to LTE. Driving home from dinner last night I noticed there was a tower across from the McDonald's distribution center in Enfield that had all sorts of stuff (rope pulleys etc) hanging off of it. Hopefully it's LTE in progress...