Are you working on a product for which knowing these answers in useful? I think the average product developer is not yet seeing the benefit the targeting Windows 8 and therefore hasn't bothered to educate themselves on the intricacies of the platform.

I have no idea whether Dropbox can work under Windows 8, and I read the various tech blogs/updates reasonably closely.

Would this work with Win8RT? (or whatever the OS they are running on their ARM surface tablets is called). What about Surface with Windows 8 Pro (or whatever the X86 Surface Tablet OS is called)?

I personally just don't want to invest my time in it. Either way, if I'm going to push something, its going to be over HTTP and not platform tied.