Chatting to someone from the airport just now, and they said that BA will be using the new C pier.
CTA channel under way.

Everything still seems to be on schedule for everything except Ryanair and Emirates.
Emirates lounge doesn't appear to have been built yet, and the C pier isn't fully A380 operational as of yet.

C pier has lights on, and it may be accessible on the next few days as the wall is starting to come down near the Aspire lounge.

Easyjet definitely coming to T2. Downstairs, but no idea where to be honest.