Hello from Paris -
This strike is yet to be confirmed by the Unions. The official statement is that the strike could be rescinded should there be new proposals by the government. One must remember that there are some 45 unions that are involved - and 42 had agreed to terms in November. Thus, this strike could only be 3 unions which could mean on minimal rail service impact.
This is no way is expected to be as extensive as the strike last month. More information should be available Monday (if not today).
Typically the strike begins at 20h00 (8pm) the night before the full day strike. This will most likely be like the strike in October - thus only a single day impact.
I will certainly post when more information becomes available here.