David or Damon may chime in here. If I am looking at the specs correctly, the P5-6 with Red comes with the BBRight compatible Rotor 3D+ crankset (with round rings). Quarq does not make a Cinco that is compatible with the 3D+ crankset. So, if you have a quarq already you would need the BBRight adapter for Shimano style cranks.
The other option, though you might be an early adopter, would be to see how/if Rotor would put their new Powermeter on the 3D+ crankset that comes with your bike.
And, another option still might be to see if there is an up/down spec to the Quarq compatible SRAM Crankset when you order the bike, but I don't think that will be an option.
EDIT: Damon beat me to it. If you have a SRAM Red Quarq already, you can get the adapters to fit.
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