Diablo 3 - Preview @ Games Radar

A lengthy Diablo 3 preview followed up with a short Q&A session can be found over at Games Radar.  It's divided into "what we know" and then more speculative "what we think" sections; here's a bit on the graphics:

Diablo III is powered by a proprietary new 3D engine (with no catchy name as of yet), and the first screens and game footage offer a taste of what it’s been built to do. The world’s depth is immediately apparent: for instance, instead of simply spawning offscreen, ghouls scramble up the walls from the unseen depths of the Forgotten Tombs, only to fall off bridges back into the mist when they’re killed. And yet, even though the objects are built in a 3D space, many of the elements look painted, particularly in the autumnal Leoric Highlands. Ankle-deep water, hazy rain, fog, smoke, and swaying grass are all benefits of the modern tech beneath the gameplay - not to mention the splattery hunks of meat and gore that come from dispatched enemies. Diablo III will support both DirectX 9 and 10, so if you haven’t upgraded your rig in a year or two, you’re not completely sunk.

...and a grab from the Q&A:

PCG: What do you think Diablo fans will be most excited about in the new game?

JW: Our co-op focus is something that we’re really proud of. I think Diablo and Diablo II were always focused on co-op, but they unintentionally did things that harmed the co-op game. We’ve really learned from that and are getting rid of [those things]. How we do loot drops is a big change for us. It used to be in Diablo II that everyone fought over the loot - the Barbs and the Paladins usually managed to win that fight, and we changed that system completely so that essentially whatever drops, drops individually for each player. So, when a monster dies, if you’ve got three people in the game, it can actually drop three different things, one for each person, and then people just see their own drops, so if you see it on the ground, you can pick it up. Overall, not only is it more friendly to cooperative play, it also doesn’t encourage people to fight - it encourages people to work together. What we found is that it actually encourages a lot of trading.