For what its worth..
My guess is that given there was initially an expectation of strike dates being announced straight after the result of the ballot, and still now more than a week on, no strike dates, WW wants to let everyone know that the threat of IA has NOT gone away, and that volunteers will still be needed, and probably explain a bit about what the company is doing to prepare, what the impact of ongoing waiting is etc.
What the company does not want is for people to be lulled into a false sense of security by the lack of announced IA.
It is still probable, even if not inevitable, and we still need to remain prepared to deal with it if/when it happens.
However from where i am sitting, it is most encouraging that there are so many volunteers, unprecidented numbers, signed up to "back ba" in one way or another, from hosting pax in T5, to meeting, to rebooking tickets, or escorting the "willing" crew in to work, to the actual volunteer crew, that there has had to be an entirely new way of managing the resource pool. Lots of work has been done to ensure that if it happens, the response can be almost instant, and resources can be sent to the areas they are needed in a timely and flexible way.