From WG RU, translated by Alex.
In 10.0 the FV4202 will be replaced by the Centurion Action X. Those players who have the FV4202 in the garage will get it replaced by the Centurion Action X, for those that have the FV4202 researched only, they will have a researched Centurion Action X (but not in garage). The FV4202 itself will be temporarily removed from the game to be rebalanced to become a Tier 8 premium tank. There will be a chance for everyone to receive the FV4202 for free, after completing a set of missions, which will be announced on the 19th of January 2016. To receive these missions you must have a Centurion Action X in your garage by the 19th of January 2016. More detailed information will be posted on the portal in the new year.