For reference, T3 is on the opposite (south) side of the main E/W runway from the current terminals. It will be accessed from the main terminals via the free SkyTrain taking 8 mins.

It's already a long walk from the train station to the main terminals - recently "enhanced" through the removal of moving walkways (MAN's management would be proud!). This will make the journey even slower.

No information yet on what the lounge access arrangements will be. I presume there will be nothing for OW pax initially, perhaps a derisory F&B voucher to be claimed at check-in if BA are feeling generous. I guess the JAL Sakura lounge will close; despite its somewhat spartan design will miss it, in particular the private room in the F section.