Has anyone played that sniper DLC yet?
Yes - it's exactly what it says, a sniping challenge.
47 is set up on a rooftop - the mission is to take out a high value target and as many of his bodyguards as you can in a nearby building.
You can just start shooting straight away, or can try and pick people off so no-one notices. There is a higher score reward for completing the mission with no alerts.
You can hide bodies by shooting people when they stand near the edge of the roof, or so they fall into a pond. You can also fire near people to distract them and move them to better positions.
There's a couple of environmental traps you can use, and there's a few collectables to find. There's also a few challenges (all headshots, finish in less than 2:30, plus a few others) which encourage you to try different things. They all add score multipliers. The higher total score you get, the more you unlock for Hitman.
The "instinct" (i forget what it's called) is exactly the same as Batman's detective vision.
Control wise, I can't say much...the right stick works

There's a bite point on the trigger which keeps the aiming recticle dead still, but I found it really fiddly - it's like a half pull on R2, but I kept firing shots by mistake. Would have preferred it to be in R3, COD style.
Graphically, it looks fine. But it's a still environment, and most of the close up detail is just in a sniper scope. I'm not actually over critical of graphics though, so couldn't tell you about anti-aliasing or screen tearing, or whatever else is bad (mmmmkay?). It will probably look better on PC, that's as much as I'm prepared to say
It's an interesting take on Hitman, but it didn't feel like a Hitman game. While I enjoyed playing it, I don't feel like I have any idea what the game is going to be like, so as a "preview" I don't think it works.