The system was always on an M Core, but it was pretty dated as far as the hardware and system release (7.14) it was running on. In addition to the new core, they are implementing virtualized prime sites for the IP Simulcast sites, which greatly reduces the amount of hardware required. A number of features being implemented were simply not available on the older system release. Also I have to check my notes, but I don't believe that there was a limit of 10 IP Simulcast sites per zone with the 7.14 core.