Lorkhan and Akatosh are not the same person. Also we aren't completely sure Alduin is truly Akatosh either.
Alduin: Creator-Destroyer. He's the http://en.wikipedia.org/wiki/Ouroboros archetype. The head and tail - the destructive/creative paradigm - are Lorkhan (the Doom Drum) and Auri-El (who's perch from Eternity allowed the Day). See http://www.imperial-library.info/content/morrowind-varieties-faith-empire and http://www.imperial-library.info/content/morrowind-monomyth.
They added mithral armor to oblivion to show they advanced.
They added mithril and "elven" armor, for their love of cozy familiarity.
I don't know how much non-Scandinavian style stuff will be in Skyrim. Todd said Hyboria was a huge inspiration, so google "Aesir," and you can probably reach a nice feel of what Skyrim will be like.
Funny he would call Hyboria an influence, since Skyrim is still noticeably "medieval," in the screens. It's going to be rather jarring fighting mammoths, then going to ye olde smithy and seeing a pixel-bimbo, dressed like a princess. I'll assume that screen shot was taken from either of the "civilized" Holds, and the mammoths are east.
I guess snow-whales are out of the question...