sa110: don't distract ROL, they have the A9 to finish before looking at anything else.
Support of multi-core is fare more likely to come from the ROOL initiative, not with symmetric multiprocessing as that's pie in sky territory for RISC OS, but rather people taking various parts of the OS and using the other cores as off load engines. For example shifting the network stack on to another core, which is of particular benefit when using computationally expensive https encryption. Much of the PCI I/O subsystems such as disc and the USB stack could be placed on another, leaving one core to run the main part of the operating system and applications, and another available to share by custom written applications which do a lot of non interactive operations, an MP3 player for instance.
But even using the single core, there will be a substantial speed increase from the both the clock speed and the additional memory bandwidth which will be available to be able to feed all 4 cores. FP would also be a bonus, and would open up float heavy APIs such as OpenGL.
Trouble is 2010 is a long way away. I've just upgraded from a 2.1mPix to a 7.1mPix camera, and I need a machine thats 3x faster than the Iyonix before then to keep my productivity at the same level.