Well, it doesn't work like that. Is it compatible, most likely - yes. Can you just download it from MS and install it to your device - no. Microsoft does not sell the OS to the consumer and thus they don't make it available to the end user to download. The manufacturer and carrier need to get their hands on it and customize it for their hardware and network. So they add stuff like drivers for cellur radio, GPS, wifi, camera, etc..., graphics, and applications. Once all that's done, the carrier still has to test the OS on their network to make sure it doesn't cause any problems with their network.
All said and done, it can be a long and painful process. So far Samsung hasn't announced anything. But we're all holding out hope.
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"I have no special talents, I am only passionately curious" - Albert Einstein