Any improvements in the boosting process in the last few years?

[Prega]

Someone on Reddit posted the other day that RAF now goes to 90. There is no official confirmation of that, so he wasn't sure if it was a bug or not.

i have atm 4 raf active with inside all groups at lvl 85 or +.
i can confirm atm looks like Raf works to 90. i ve done some tests in past days: with recruiter and recruited together bonus xp is about triple then with the recruited only. composition: 1 booster lvl100 + 2 recruiter+2 recruited. if i drop a recruider, i got 1/3 of xp on that character.
i opened a ticket in wow forum asking info about it. No response atm.
Looks not implemented on grant levels, need some more tests. but looks like it s not working retroactive atm.

PS to offer more info:
info with my composition. it s possible and just a bit boring do 85-90 in Temple of Jade serpent with raf. 7/8 runs. some more then 1 hour.