Well I am sure we will know if 50%+1 of current cabin crew have signed the new deal soon, but silence could be deafening.
Actually I think we'll only know this if BA go down the derecognition route. Otherwise it's nobody's business, other than between BA and each of its employees individually. BA clearly don't think it's (share) price sensitive, otherwise they would have ensured they had the numbers before releasing their trading statement today. What matters is that BA knows the numbers and can formulate their position accordingly. Unite do not know the numbers and can only estimate the degree to which BA is bluffing when they meet again next week.