Mirrors egde demo is up on UK store. ( impressions).

[king_of_the_castle]

Here's one comment I found on why they went that direction:

Patrick Soderlund, General Manager of EA DICE, commented: "We are a studio that believes in taking risks and taking games in new directions. We made the sandbox experience viable and enjoyable in Battlefield and now, we are looking to do something radical with the traditional established mechanics of first person movement."

Senior producer, Owen O'Brien, commented: "We want to change the way that players are able to move in first person. No more restrictions, no more being blocked by simple barriers such as walls and fences. We want to enable the player to move like a real person, with the ability to run, jump, vault and slide in a way that has never been seen before in a first person game."