Bluetooth "unknown" hardware address showing up as Network Sharing address

On a brand new out-of-the-box iMac (27-inch, Mid 2011) OS 10.7.3, the Bluetooth "unknownxxxxxxxxxxxx" hardware address showing up in Network Sharing preferences as shared name under File Sharing, Remote Login and Remote Management. the first portion is the same as the Bluetooth hardware address for the Apple Wireless Keyboard and Apple Magic Mouse that came with and is connected to this computer. I have an existing Magic Trackpad connected that has a completely different hardware address.

I have never seen this before, and it does not do this on my iMac (27-inch Late 2009) OS 10.7.3.

Any ideas? Is this an indication of a potential hardware/networking issue? Would a clean install perhaps clear it up? I would like to know if I should exchange the machine or if it's really nothing.

Thanks!