So basically they've deliberately chosen to continue development using a CPU that is no longer manufactured/developed ... way to go for upgrades and future support!
The PA6T paves the way for SMP support under AmigaOS4.x Also check out the new multi-core CPUs being developed by Freescale, in particular the 64-bit dual core, 2.2 GHz P5020 and the 8-core, 1.5GHz P4080.
TrevorD