Quote Originally Posted by Archaell View Post
It wouldn't be much of transition period were the mentor roulette removed during it, so it's quite possible that mentors keep their full rights till December and then continue with uncertified mentor status in NN. Considering that there are also crafting mentors, SE might consider NN requirements being lower than the roulette requirements and let the ghost mentors provide support there.
Until 5.1 all Mentors are stay as they are.
From 5.1 to 5.2 they have recertification period when your icon will be normal (pve/pvp/trade) if you finished it and special one if you didn't.
From 5.2 if Mentor didn't finish his recertification, he loses the status entirely including losing access to NN since he isn't a Mentor anymore.

Once more, from 5.0 patch note:

However, as of patch 5.1, to ensure that all mentors are held to the same standard, changes will be implemented to encourage mentors who qualified under the old system to obtain recertification.
* Please note that mentors who do not do this during patch 5.1 will lose their certification in 5.2