Given how long it took Intel to release a good 64-bit architecture, dragged ear-first by AMD, it does seem a little odd for them to lead the tablet charge. ARM developers are still focusing on 32-bit architectures and current Windows 8.1 tablets tend to stick with 32-bit because of Connected Standby bugs. Both of these should be cleared up soon.
Also, 64-bit Android tablets should be available this spring based on Bay Trail.
According to Peter Bright of Ars Technica, Android will be first to 64-bit on its x86 build while the ARM variant hovers at 32-bit for a little while longer. It would not surprise me if Intel's software engineers contributed heavily to this development (which is a good thing). I expect NVIDIA to do the same, if necessary, to ensure that Project Denver will launch successfully later this year.
The most interesting part about this is how the PC industry, a symbol of corporate survival of the fittest, typically stomps on siloed competitors but is now facing the ARM industry built on a similar Darwin-based logic. Both embrace openness apart from a few patented instruction sets. Who will win? Well, probably Web Standards, but that is neither here nor there.