Apple has released an update to mid-2012 MacBook Pro models to fix an issue with some Thunderbolt cables. The 442KB update is available via Apple's support site and the Mac App Store.
About Thunderbolt Firmware Update v1.1 This update addresses an issue with MacBook Pro (mid 2012) and some Thunderbolt cables that may prevent bus-powered Thunderbolt devices from functioning properly.
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By the time Belkin actually releases its long awaited Thunderbolt breakout box, Apple will have already moved on to the next gen Applebolt standard declaring Thunderbolt a slow and obsolete technology, of course they will gladly sell you a $39 dongle so you can connect at least some of your antique accessories to the new port.
You know those professional computers who's users are the ones most likely to adopt a technology like Thunderbolt, which was designed to be as fast as possible for professional use!