Given that I only own the original game and I have none of the expansions, I might consider this. Especially if it adds features that aren't in the original game (although surely they are going to patch it in for people that already own the original version?).
Actually, I haven't had a good run in Skyrim for a while now...I might go home and fight some dragons.
As a owner of the original and all of the DLC I would be pretty upset if they didn't add:
" ... features like combat cameras, mounted combat, Legendary difficulty mode for hardcore players, and Legendary skills."
I think "Legendary Skills" were added in the last patch. I'm fairly sure that they will patch these features in for everyone else.