The skies of Northrend

One of the latest screenshots of Wrath of the Lich King shows a pink-colored sky over Northrend, with some possible cloud-moving effect I haven't seen in WoW before. When I look at this screenshot I imagine all those clouds roiling in the sky and I wonder if Northrend couldn't possibly beat Outland in most interesting skies after all.

It's a tough comparison -- Outland planets floating above the horizon are hard to beat, whereas Northrend will be limited to a more terrestrial skyscape. When The Burning Crusade first came out, I remember being impressed that the skies had any animation at all, whereas now, of course, the bar has been raised much much higher. Still, there's a lot that the skies of Northrend could offer us, especially if Blizzard were to go crazy with clouds and colors inspired by the Aurora Borealis.

What do you expect of future WoW skies? Do you hope for ever-increasing complexity, or do you think simple and realistic is always best?