there is a small update on the FV4202 Mission by MrConway:
To be eligible for the mission you will need to have the Centurion Action X purchased and in your garage!
The mission details and (if any) cutoff date for this condition will be announced round about the 19th of January.
To the grind gentlemen!"
He also says that unfortunately WG cannot promise that the missions will be published before the deadline, but it is likely.