FlightFactor has today posted via their social networks a quick status update on the ongoing beta testing of their Airbus A350 rendition for X-Plane 11. Based on the developer, the first round of beta testing has been succesfully completed. The beta testing team has discovered several bugs that are being fixed, and the secound round of testing has begun.
Regarding the private beta testing request, it has been made clear, that FlightFactor is not looking for beta testers, and messaging them with such requests is pointless. The release date is still unknown, and the update will be free for current owners.
If you want to learn more about this update, I recommend you to read our previous articles.