BOS, HKG and NRT flights are all at T4, so no problems. I've heard nothing about changes to the Concorde Room - and it would be sacrilege if there were. If you're actually flying First, you should use the Concorde Room in preference to the First lounge, by all accounts.
And yes, come over to the
BA forum for more insights.
[Edited to add:]
TBS (below) is right about the NRT flights. I hadn't noticed your travel dates.
[This message has been edited by Globaliser (edited 10-08-2003).]