It has been confirmed that the 2009 Escalade L9H engine WILL HAVE Active Fuel Management in addition to the E85 capability.
Here is a link that lists it under official Cadillac changes:
http://www.cheersandgears.com/forums...hp?t23499.html
Also, I just confirmed this with Scott Pratt at Superior Cadillac. He seems to have all the good insider info.
Hope this helps!
SG