Sprint just announced a slew of new cities they added to their LTE roster. They now have over 30 markets under their LTE umbrella. Here's a list of new areas:

In Indiana:
  • Addison
  • Bolingbrook
  • Des Plaines
  • Downers Grove
  • Kankakee
  • Rockford
  • Joliet
  • Naperville
  • Palatine
  • Plainfield
  • Gary

Sprint also expanded network coverage to Wichita Falls, Texas
Additionally, their 4G LTE was also turned on in Hutchinson and McPherson, Kansas.
Finally they also activated the service in New Bedford and Fall River, Massachusetts.

Source: Sprint Newsroom