Here's my educated guess:
Sprint is installing shiny new site equipment with new backhaul (microwave, fiber, or what have you). So they set up shiny new network "cores", or data centers, with all the network routers and such. Cutover is probably much simpler and less disruptive than trying to work with the legacy locations.
That's what I figger anyway.
Sounds good and completely plausible.
Robert













