2nd day of AC ops, but yes very exciting
I think you can consider the date in stone. UA is moving in 2 weeks earlier on June 4 and I assume they would iron out any wrinkles.
Either I've been asleep, or AC hasn't announced lounges for LHR T2. United announced its Global First and UA Lounges earlier this month - the F Lounge looks very nice. But I have yet to personally hear of any arrivals lounge...
http://www.businesstraveller.com/new...row-t2-lounges