I've heard that the 767's will be staying and the 787's are now expansion aircraft rather than replacement aircraft.
Wouldnt surprise me at all, especially considering the IAG deal with LH for BMI, BA are going to need Longhaul aircraft in a hurry as well as higher capacity aircraft so that they can reduce the current BA/BMI rotations on some domestic destinations without dropping capacity, why send 3 airbus when you can send 2 767s etc !
cs