For the people who don't know, the guy who posted this "leak" has posted 2 previous Mass Effect leaks, and both were very accurate. You can see here, the Hearth Fire "leak" is the most recent submission from this user, http://www.reddit.com/user/derptemp6698/submitted/
It still might be BS, but I think there is a good chance this person knows what they are talking about. They certainly knew all about the ME3 DLCs "Rebellion" and "Earth"
But he's wrong on this one.
The picture is clearly from a DLC for The Elder Scrolls IV: Oblivion. It's a Wizard's Tower that the player gets bequeathed or some such thing. Look at the cross-hairs in the picture. Blatantly Oblivion, not to mention the graphical quality gives it away as Oblivion and not Skyrim.
The "leak" is nothing more than the picture creators attempt to troll IMO, and the picture creator has apparently succeeded in his/her goal.