> Nvidia's Denver might be 64 bit [...]. [...] I am unsure
> about whether or not Denver will be 64 bit or not

CEO of nVidia on Denver two months ago:

"To take the ARM processor, partner with them to develop a next-generation 64 bit processor to extend it so that all of computing can have the benefits of that instruction set architecture. It is backward-compatible with today’s ARM processors."
http://venturebeat.com/2011/03/04/qa-nvidia-chief-explains-his-strategy-for-winning-in-mobile-computing/