Enemy will be out on DVD next month, confirming another hard-to-believe claim from longtime rumor sources. Web will follow next year; Amazon's listing says February, though that's not confirmed. These are UK dates, presumably, though I doubt the US will be far behind. The artwork for both seems to say 2-disc set, so special features have apparently been prepared, as was also rumored.
There are clips from and trailers for the episodes on YouTube now as well.