It is underway according to this article. Sounds like ALOT of work! Samsung Network Vision/LTE Deployment schedule & details for Sprint's Chicago Market - Sprint 4G Rollout Updates
Apparently Network Vision is causing ALOT of problems here. CONSTANT dropped calls in these areas because of the clusters being deployed. One part of town your NID will be XX, then a few blocks over it will be NID XXX. The network can't hand off between the two, dropping you on your *** Just like one of the posters in this Sprint Community forum says...nobody has done a story on this yet. Surprising since everytime Verizon farts, they are all there to write a story. Sprint Community: Network down? Aurora IL, 60504