If they will have something to announce soon, I think that this is both clever and well-done.
If not, I think that this is a bizarre signal to send given the near-total vacuum of substantive information on negotiations progress. If we knew how things were going, the intent of this picture would be easier to parse. Coded message or light-hearted Holiday fun?
I hope they have something to announce. If they don’t, this could make them look like a bunch of dilettantes when the amendable date comes and goes.