Talkgroup 44362 was added to the database last week. It's what's used for a lot of this testing ongoing at this time. Not sure if it will be a long-term FD use talkgroup or not. Generally heard on the Greenville Simulcast system.
It's not uncommon these days for buildings to have wireless "enhancement" systems installed, especially for large commercial buildings. "DAS" is the industry buzzword that stands for Distributed Antenna System. Mostly for commercial wireless (ie, "cell phones") but also for public safety. They aren't required in most locations at this time, but that will likely change in the near future. That's makes an agency's change of band (ie, VHF to 800) a big deal if lots of buildings have any type of this in place for public safety.
Encryption is no more easier or difficult on P25 Phase II compared to Phase I.
Most in the fire service would tell you that simplest is best for radios on a fireground, ie at an active fire. That's why most fire departments that use a trunked radio system will have plenty of "old technology" - analog, conventional, non-repeated radio channels to use for tactical operations. It sounds like the East Grvl County fire departments are going that route, to the chagrin of us hobbyists.