WhiteKnightTwo has flown now 77 times. http://www.scaled.com/projects/whiteknighttwo_flight_test_summaries

At the last flight Dec 06, the rocket was not with it any more. Is that because RocketMotorTwo will be installed to SpaceShipTwo?

RocketMotorTwo is tested more, the last time it was used Nov 29. It had first 10 second  and then 58 second hot fire.

http://www.scaled.com/projects/rocketmotortwo_hot-fire_test_summaries