fyi there is content for at least one more WoW expansion past the next one (the emerald dream/corruption of the green dragon aspects)
but thats besides the point
Diablo 2 looks amazing. It looks like they fixed the problems with Diablo 1/2 (limited hotkeys, poor inventory management, much too linear gameplay style) and went for a more Dungeon Siege-type game, while keeping with the Diablo feel. Not to meantion that graphically (all those nasty spell effects and blood/gore) it looks fantastic.
I just wonder, if since they are trying to amplify the "Party" aspect of the game, if there will be a Healer class of any type. I mean, with the weird red gems, and potions and such, healers have never been important in Diablo but maybe some sort of support caster with healing capabilities just to enhance the party aspect of the game.