I heard a rumor today that they will not be active until Octobor 1st. As with past 4G Rollouts, sprint has waited until specific dates so that the rollout is synced with other cities. I predict that Octobor 1st will be the date that Sprint has it's next major rollout throughout the nation.
I'm wondering if sprint will setup 4g near the Fair Grounds like verizon did for there rollout. Although I wish the date was closer, It does make me happy to see that activity for these towers has suddenly grown substantually in the past week.