Divinity Original Sin. For those of you who aren't familiar with it, it's a computer role playing game with tactical combat similar to Baldur's Gate 2. BG2 was one of the best games ever released so anything that can be mentioned in the same breath is thrilling.
From what I've seen on YouTube, you can interact with everything in this game. Move chests, chairs, brooms, etc. But, you'll be limited by your characters ability to do so. Trying to move a heavy chest when your toon is a weak mage? Better use telekenisis rather than brute strength.
It's also going to be smart about the environment. For example if you want to steal an object be sure nobody is looking! That's a great advancement from most other games where you can pretty much do whatever you want. Or, in best case scenarios, whatever you want as long as nobody is in the room. (Hat tip, Ultima III)
Plus, you'll be able to cast spells that cause rain which can in turn electrify your friends/enemies (friendly fire!) or douse flames. Coupled with the fact that you won't find a ton of quest helpers and you can see losing yourself just in the exploratory phase of this game.
The clincher for me is that it's got tactical combat. I do enjoy games like Guild Wars 2 and Diablo 2 (booo, D3) but I'd rather use my brain than test my twitch so being able to pause and think is a big win. (I'm also psyched that they've agreed to release a linux port of this game so I can play it on my lovely Debian system.)
One thing this game has which will be really nice is the ability to play with one other person. Each of you can have a henchman, cooperate or disagree, and work like a real team. At first I thought this was kind of lame but let's face it: it's way easier to find one person to play with than a group of 4. And even if I do find 4 friends who want to play, the way this game is looking I think I'll be really happy to try a few different playstyles with different groups.
Early indications from Steam early access is that it's living up to the hype. One more week and then we'll see!