As long as there are still FDMA only sites around, and there is at least one radio affilliated to a FDMA only site, you will still hear them fine on a FDMA only scanner. Being in Hattiesburg you're getting that benefit from Fountainbleau at the very least for the time being. There may be others in the region too. During off peak hours though I bet you're missing some MFC and F&W traffic.
For the last 24 hours, or so, I've logged:
Vancleave: 37 TDMA channel grants (pretty much all F&W from a quick look) compard to 2489 FDMA grants(CWID's included)
Benndale: 78 TDMA grants(roughly half of which were Wiggins PD or F&W Tac, with the remaining F&W South B) compared to 2228 FDMA grants.(CWID's included)
Fountainbleau: 1999 FDMA only grants.(CWID's included)
Yep, the sites that are updated for TDMA, and have added freqs. that are not covered under the state license, now send two CWID's on two different channels. The same one as always for WPTZ808, and a new channel for the new license.