I would love to be wrong, but I don't expect to see an Iyonix II, or for that matter any new ARM-based machines designed to run RISC OS. I don't think there's any money in it anymore. The MD of ROL has been reported as saying the same thing. This is not necessarily something to get too upset about: there's a choice of eumlators, and the ROOL project may result in a port to other ARM-based machines.
If you buy an Iyonix tomorrow, however, and an Iyonix II comes out on Monday, I take it all back