Expect to see 2 hardtails 650B models from the BMX roots company HARO. This won't be any time soon, keep watching for conversion possibilities until 2009 models hit.
I currently have the Sonix with the virtual link as my FS ride. (650B equipped) I couldn't run a Ne0-M0T0 on the back though, so I picked up a cheap, low knob substitute. It clears with the stock front derailleur changed. I'll post an image tomorrow, as I am currently swapping out forks. My alternative tire was an ebay purchase, and I wouldn't recommend it for substantial off-road use.