Now, I want you to think of the different possibilities to that:
1. They could still be developing the User Interface, and havent added Attributes to the menu yet.
2. It could be in a different part of the menu than skills.
3. It could be incorporated in that menu, we just didn't see it from that perticular screenshot (sort of how we didn't see all the skills in that screen either)
Okay, so those are three equally plausible possibilities, however they are only possibilities, and thus cannot be thought to show that ATTRIBUTES are in the game.
But, thinking logicially we can see:
1. Skyrim is a rpg. What's the last rpg you played that has no attribute system? Mass Effect dosen't count.
2. It's a BETHESDA game. They base your character, leveling, development, abilities etc so very much on your attributes that it seems unlikely for the system to be gone? What else would they do to determine how fast you run, how much damage you take from falling, your encumberance, weight, etc?
(2A). People have speculated that the atribute system will be replaced with a leveling system of choosing, upon level up, to buff your magic, health, or fatigue. While this might be a confirmed game mechanic, it most certainly dosen't show that attributes are gone. Magica, fatigue and health determining attributes are most probably incorporated differently this time around, such as Intelligence determining how well you can cast spells, your magica increase (If chosen) upon level up, etc.
3. How would elder scrolls work without attributes? Would your speed be determined by your race, and remain fixed for the entire game? Would your sneak skill be based on the level of your sneak skill only, or would it be accompanied by your agility?
4. What reason would they have to remove it? It's a system that works, whether it be Elder Scrolls, or even fallout (With S.P.E.C.I.A.L.)
Here's what I think. They are doing big things to attributes, really changing the impact they have on character. They will have real uses and concequences, some might even be removed. (Like Speed) But they most likely are being drasticially altered, and in fact might not be completely ready for a demonstration to the public.