I heard earlier today that BA are moving to Terminal B at Paris CDG at the beginning of December. The shift follows the move of Star Alliance carriers back to Terminal 1. 2AC, where BA currently sits, is to have some work done, but I'm unclear if that means BA will move back to 2AC at a later point. NB it appears that all 2AC carriers are moving at some point over the next 6 weeks.

On lounge access, 2B has a contract lounge (Extime) that's been used by Star carriers including LH group airlines. I guess that will be the contract lounge for a while. Doubt it will be as good as the AA or CX lounges, but hopefully the opening hours will better match BA's schedule.