Actually I've read Todd's explanation about removing Acrobatics and Athletics, he said: "Who creates a character that doesn't run?" Personally, I find it logical. Running and jumping is -always- a part of the game, while other skills aren't (For some people, like pure mages, or pure warriors and such).
I think it won't stay the same though, I think different races will have different speeds/jumps. I think it might be perk-related to level up your speed/jump. And I agree with the whole raising the fatigue to sprint longer as we already know that sprinting drains our fatigue. So I guess we still have all the things we had in Oblivion/Morrowind, but only in a different form, maybe even a better form.
Don't worry about it
I'm sure it'll turn out fine.