[pbx]

More than one reason for doing this

"...the twin shock layout is a concept being developed jointly with their subsidiary Öhlins and is intended to better permit controlled chassis flex..."

It's not really clear, to me anyway, from the information Yamaha has posted that the twin-shock arrangement is directly related to frame flex. They do say that using twin shocks gives them freedom to play with the rear swingarm and its relation to the "experimental," flexible version of the Deltabox chassis they are using.

I'm pretty sure that within the last year or so Kevin Cameron (in his Cycle World column) said something to the effect that twin shocks would eventually come back into favor. Anybody got a cite for that?