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You will need some kind of cable stop, Paul ones are great and work on all sized frames (esp small ones) but you can go cheap, Surly rear, Tektro (steerer) mounted one front or something.
Yes there is a QR mechanism, you just squeeze them with hands and 'release' the straddle.
Great brakes, you will love them. Make sure you get the measurements right. Benchmark it against the current calliper you have and the 650b rim surface will be 19mm below that.
A question about Paul Racer brakes (this thread seemed as good a place as any to ask):
The full reach ones, on the front, with a Paul funky monkey hanger. Is there a QR system for removing and installing the wheel and tyre, or is it not needed in some way?