Since the APX 8000 is a 4-band radio (VHF, UHF, UHF-T, 700/800), it can operate on their current VHF frequencies as well as being capable in the state 800 system. You're right that there's a lack of info on their future plans. The area's OHP Troop M is only nominally on the 800 system but there's no info on any talkgroup assignments for APD to put their new capability to use.
Even more interesting is the $4100 per unit price they got on that purchase. I'd understood most of the APX line model numbers were close to the price. Looking at the Motorola list of options, it appears there are ways to keep costs down.