Hope this info is of some help, some of it is second hand info.
BA do not plan to return G-BNLA or G-BNLD to service. Last I heard G-BNLH was planned to remain in storage for at least the S11 season.
G-BNLG returned from VCV last month and is currently undergoing pre return to service maintanance.
G-STBD is due to be delivered in October with G-STBE arriving in December and G-STBF will join the fleet in February.
The summer schedule remains tight through until September.
Looking ahead BA have already made a number of cuts to frequencies during it's W11/12 timetable. During the Winter BA will begin the refurbishment of a number of there 767 and of there non AVOD 777's.
At LGW a decision on the shorthaul fleet replacement is rumoured to be iniment. The aircraft ordered will all be delivered new to LGW. The order is almost certainly to be awarded to airbus. With a mix of the A318 and A319's rumoured to be the likely replacement for the 737-400