They had it in New Vegas, so I guess it makes sense that Bethesda would adopt it for TES. In NV you could get health from both raw and cooked meats, but the raw meats had a penalty to your strength. --- http://i73.photobucket.com/albums/i215/estonc/grizzly_bear_chairs_2.jpg
This was confirmed a long time ago, like early Feb.:
12:55 Are you going to be able to craft spells, potions, and other items?
"We do have crafting within each discipline now. We do have smithing, enchanting is back as a skill, and then alchemy we're sort of treating as - it doesn't matter that much anymore (stealth/magic/combat categories) - but it's sort of in our stealth category now. We have a blended skill list, so alchemy is sort of the most magical of the stealth skills. And then we have lots of other things that are NOT skill based that you can craft, like cooking and things like that.
There is a lot of that, and more emphasis on it this time around."
And yes, there will be mammoth meat (trunk meat, delicious). I forget if this was from the art of skyrim video or the behind the scenes video: