The R1200GS and RT will use a detuned version of the HP2S engine, the bikes should be shown at the upcomming Intermot, USA deliveries to dealers will prolly be in Feb. Current luggage and accessories should fit on the new bikes, valve adjustment will be bucket and shims, the same shims used in the K1200/1300 and the vertical twin 800's. Valve adjustment intervals should longer, but not sure about this.
RWHP's should be in the 105 to 110range with similar torques as the current R12's but starting at lower R's.
I have San Jose's first one on order............