They're going to be the same races, yes, but I'm hoping they're more diverse and not so cookie-cutter in relation to one-another.
I want Argonians who look like Argonians (What happened to you Argonians??). Dunmer to look like ... Dunmer, not prissy little school girl sounding fairy elves.
If you're referring to the difference between the Argonians of Morrowind and Oblivion, then all they did was just go back to the http://media.photobucket.com/image/argonian%20daggerfall/Maccabeus/daggerfall/fall_061.png.
Though yeah. I would definitely love the Dunmer to be a bit more "rugged" like they used to be overall. The Dunmer in Oblivion were way too prissy. They were more like blue-skinned Altmer than anything.