Since it registers itself as a storage provider, it doesn't really need to sync locally. File open/save dialogs in Metro apps have a Dropbox location once the app is installed, same as SkyDrive (or Documents, Photos, etc). That's preferable on RT devices, which this app is probably primarily aimed at.
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)?
Most companies don't even have any apps out for their services. There isn't even a Spotify, Rdio, or Pandora apps, and they have a lot more to gain. Releasing Win8 apps is a pretty low priority item for almost everyone.
Well, it really only makes sense to not put a higher priority if the main target user base would be desktop users. However, if they are trying to target Surface RT users or something similar, it would make a lot of sense to go for something that works right now because desktop mode is pretty much unusable without mouse/trackpad.
I think that's probably a waste of time. We've only had one visitor on windows 8 and after doing a reverse lookup on the IP, it turned out to be coming from us and was a member of our QA team.