You do not have to be a member to read the info, if you go to their website, click on becoming a pilot and then download the adobe file, it gives a list of airlines that sponsor and a piece on the Brits one.
Although I agree that Brits haven't confirmed anything, although they may have been in consultation with BALPA about their plans. BALPA could have jumped the gun (in a helpful kinda way, by publicising it).
Everyone will just have to wait and see until Britannia announce it on their website or in aviation mags.
Sagey