I think the reference to BA in numerous reports ("BA announcement ...") may have been a reference to Boeing's stock code. People saw "BA" and an announcement in London and put two and two together.
That said, a 7E7 order from BA is certainly not inconceivable.
Interestingly, this week's Flight refers to possible orders from SIA (a near certainty), Emirates, Kuwait Airways, the Chinese govt and a new Chinese leasing company.
EK, SQ, KU and NZ are interesting in that they are either existing operators (EK) of - or had strongly considered - the A330-200. I had ANZ down as a sure bet, but all the better for the 7E7. By targetting prospective or even existing 332 operators, Boeing is clearly sending out a message that the 332 is old hat and the 7E7 is a replacement for it and older types, like 767s.