Hypothermia, etc., à la Frostfall, perhaps?
Seems unlikely, but that's what first comes to mind with this name. Or perhaps it's related to the book, http://www.uesp.net/wiki/Skyrim:2920,_Hearth_Fire,_v9
I'm not familiar with any screenshot, but it was reported that Bethesda filed a http://tarr.uspto.gov/servlet/tarr?regser=serial&entry=85634522 for use of this term in connection with the class of products including "downloadable computer game software offered via the internet and wireless devices"
Yes, but I read that they did the same thing with the term "dragonborn" a while back. It doesn't mean that it's necessarily the title of the dlc. It could just be some aspect of a patch or even dawnguard that they felt needed to be trademarked. My mom is the businesswoman though, not me haha, so I'm no expert on this stuff