It appears that QF have stopped selling J seats on QF301 (ie: BA10), so perhaps they are starting to make some plans. Still selling Y though.
And Qantas has released this bit of information:
Fly - Major Disruptions
British Airways Cabin Crew Industrial Action
British Airways (BA) has advised that its cabin crew have voted in favour of industrial action. No dates or other details are available at this stage.
Any industrial action would have no impact on Qantas operated services.
Qantas is closely monitoring the situation and developing contingency plans to minimise the impact on Qantas customers booked to travel on BA services, should the need arise.