A leaked webcast of the improvements to and new features in FIFA 12 graced YouTube earlier this week, was removed, and has returned. It's about 10 minutes of new stuff, some of it highly technical, but for FIFAphiles, it sheds plenty of light on the "Impact Engine" anchoring this year's batch of upgrades.

Operation Sports broke down the video. Here's what to watch for:

• Tactical Defending - Contain
• Tactical Defending - New Opportunities
• Dribbling - Jog Speed Turn Radius
• Precision Dribbling - Precision Turn Radius
• Precision Dribbling - Dribble While Shielding
• Compares FIFA 11 Tackling Physics with the New Impact Engine Tackling (WOW! What a difference! I mean, WOW!)
• Impact Engine - Shielding
• Impact Engine - Unexpected Behaviors (Shows an AWESOME animation of a defender coming in, offensive player makes a move and does a flip)
• Impact Engine - Variety (Shows a defender taking out a player that is going after the ball)
• Impact Engine - Contextual Dribble Turns (Shows a player tapping the ball ahead, just a bit, then jumping to avoid a sliding tackle)
• Impact Engine - Difficult Situations (Shows a player trying to kick the ball, but hits the other players foot instead and falls over)
• Impact Engine - Shared Collisions (Shows 2 players going after the ball, each player had his own animation, depending on situation. In this particular one, it showed a player reaching out to kick a ball and the defender trying the same, after the ball is touched, the players lose balance and just looks very real)
• Impact Engine - True Injuries (Woah... Shows a player getting roughed up, trying to advance the ball, he lands awkwardly on his right knee, after a little act job, he grabs his knee and gets up, gingerly)
• True Injuries - Self Injuries (Damn, this is a great video. Anyways, this shows a player getting injured with nobody around him, looked like a strained groin and the defender takes the ball away)
• True Injuries - Re-Injury (Shows a player getting tripped up and waving to the sidelines for someone to get him or sub in for him)
• Impact Engine - Pushing and Pulling - Shows players pushing and pulling for position

In other FIFA news, Dortmund stopper Mats Hummels is rumored to be the global cover star, according to German gaming site videogameszone.