Why C-sharp / mono ?? This could almost be done (on Linux at least) with a copy of rsync, git (for the revision control) and a shell script.
There isn't much source code there though. It looks more like a proof of concept. I doubt anything is "coming soon" here.
Perhaps this was done to make it easier to port to other OS later?
Er, well, yeah, but you'd be polling almost constantly if you're trying to emulate what Dropbox does. I don't know exactly how Dropbox knows when I add or change a file -- I assume it ties in to the kernel. Also, rsync wouldn't work over HTTP, which is a big disadvantage in some of the environments I've been working in lately.
My big question, though: why isn't someone doing this for headless servers? Why do they always assume people just want this for desktops? At least you can hack a headless version of Dropbox on Linux.