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Locking or keyed skewers can be handy in the urban environment where wheels are both a valuable commodity and relatively easily stolen from bikes that are otherwise locked. The problem with many of the keyed systems is that they require you to have a special tool in order to remove, in my case inevitably leading to a flat tire and not having the tool specific for that bike on hand. OnGuard created the Minpin for people not looking for another tool in their life—the skewers instead rely on gravity to to lock and unlock. With the bike upright, the skewers close and lock, turn it upside down and the skewer opens freely like any other. There is simply a ball bearing that moves within a channel inside the cam mechanism, locking it closed in the upright position. 
Being that most bike thefts are crimes of convenience and not done by professionals, this seems enough to me to keep wheels yours—if a pro thief wants anything you have consider it gone no matter what sort of lock you use. If the casual thief can’t figure it out in a few seconds they’re moving on to the next bike with wheels that just pop off, as evidenced by how much more common front wheels thefts are as compared to rear. These will be available for 2012 with f/r wheel skewers and an optional seat collar qr skewer.
seems like they’re just like the Zefal lock and roll (available now)
No, no, no! Don’t make this public or all the bike thieves will know about this… :-O
probably a good deterrent. A magnet would probably open it.
I hope they’re using an amagnetic ball bearing, like stainless steel or ceramic. Aluminum would even work.
Yeah, there is a similar one out there and honestly I tried a set of them at the store and they are sort of difficult to get open when you want to. We were shaking the bike around trying to get it to release and it took a while. So hopefully these ones are more user friendly. Cable lock through the wheels works fine for me, although pittsburgh isn’t real bad when it comes to bike theft.