You are correct:I believe they had servos until the end of production in 2009. I can say with certainty that my 2007 has servo activated brakes.
John you actually thoroughly detailed the difference in a sept. 5, 2015 post, see below:You are correct:
The K1200LT is probably the only BMW where they choose NOT to replace the IABS with next ABS generation (non servos) for 2007 and later. All other large engine models (1200 and up) got the new simpler (non servos) by TEVE beginning late 2006.
Of course, BMW knew very well they were planning to end production of K1200LT in 2008 so why bother with engineering changes for a limited production model - by that time the K1200LT was not selling in very large number.