A few weeks ago a huge 17 minute gameplay video of Hitman: Absolution surfaced that showcased a significant peek into what you can expect from the finished product. Square Enix has released the same footage again, but this time they brought two directors from IO Interactive to add commentary through the whole thing.
The commentary provides a lot of good insight into how major design decisions were made during development; such as the "Instinct" feature which only came about because the developers couldn't remember the paths of the AI's themselves. Also, the part where they try to justify the hippie hangout is surprisingly humorous. If you're really curious about the game design process or you're just a diehard Hitman fan, definitely give this video a watch.