They're in the house! The brand new ultra-wide all-aluminum iMac has been unboxed inside the hallowed halls of the Engadget HQ, and inside was a real scarcity of wires, a keyboard, and of course that brand new multitouch Magic Mouse. It feels much thinner than its predecessor, and the whole front of the unit provides a satisfying, unified click. The runners on the bottom make the mouse seem almost more appropriate for sledding than mousing, but it glides around just fine on a solid surface. Pics galore in the gallery bel