This wasn't mentioned in the MTBR Interbike coverage, but Litespeed has a line of bikes that are convertible between 26" and 650B (oh what innovation!). It's called the Multi Wheel Compatible" wheel system, or MWC.
Honestly, I don't get it
26in/650b Combo From Litespeed ? Interbike 2012 - BikeRadar
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Thread: Litespeed MWC