The main one difference that Bethesda was trying to sell is that SE is on a 64-bit engine instead on 32-bit.
Anyone who owns Skyrim + all 4 3 DLCs will get the upcoming Special Edition for free. I've been running into tons of dragons with those three active. Discover the magic of the internet at Imgur, a community powered entertainment destination.
The seemingly impossible has been done, Skyrim has come to the Nintendo Switch.
Im running over 400 mods with SKSE64 and a fair bit of SKSE mods aswell.