I also have a 1200 Adventure on order and havent been asked the question on ABS yet.
I also currently ride an 04 twin spark 1150 Adventure - which has ABS as standard with those %$$#^ servo assisted brakes. You can switch the ABS off for off road use which is helpful. I also occasionally ride off road but mainly use the bike for long distance touring.
Will I take the ABS option? I am not sure to be honest..
The whole brake set up on my current Adventure is the only bad thing about an otherwise excellent motorcycle. The problem is the servo assist - it is really is bad IMHO.
The things I hate are listed below:
NOISY!
No braking when engine is not running (a bit disconcerting when manouvering the thing in car parks).
Wooden feel to the brakes...
Less input to the rider.
The good thing is that when push comes to shove the ABS does work well.
It will be interesting to see if they have improved the brakes on the new bike, but to be honest I think its probably more of the same..
Q. Did you notice the new 1200 Adventure screen has 'tank wings' as standard? Way cool for touring imho. Also out of interest I have the Tourtechs cases fitted to my current bike and they are awesome! I am sure the new BMW cases (which are made by Tourtech btw) will be just as good.
Delivery on mine (I am number 2 in the queue) is scheduled for May '06. I CANT WAIT!!!!!!!!!!