Two-Tone-Blue,
Rumour has it that ballots may be dispatched around 6 January. 4 weeks for balloting, plus at least a week notice to BA would put potential industrial action past the court hearing in early Feb. It seems that this time, BASSA/Unite are not at all sure of their ground - they don't really wish to strike until the outcome of the court case is known.
If the trip is important to you, I would book elsewhere.