MPN,
I'm sure BA will sort us out so that we are not too disadvantaged. I flew domestic last May (just escaped the ash clouds one way!) and BA rescheduled and the rescheduled again no problem when the strike was called off.
I booked in Nov / Dec fully aware of the dispute but given my experience in May, I have no qualms that BA will sort it - but just could do without the hassle right now - we have a relatively early LH out of LHR so may have to come down the night before.