True LHR long haul is where BA really makes money and it does that through maintaining yields. I think anyone expecting a sudden expansion of LHR long haul from the next Winter season is going to be disappointed. BA acquired a decent number of slot pairs (8+) for the Summer 2012 season and the slots were used quite conservatively (extra short-haul and extra MIA & JFK, and modest extra HKG and JNB frequencies which seem to have been reversed for the Winter season).
BA had the scope to increase LHR long haul for Summer 2012 by substantially more than it chose to do. As I say the long haul expansion will be steady and carefully managed when the right aircraft (ie the 787) are available.
A sudden aggressive increase in LHR long haul capacity ahead of revenue is a fast track to red ink all over the profit and loss account.