I think I have read it on Dulfy.
And also there is absolutely no logic for level 50 to have set bonus, as its no longer end game gear. Equivalent would be to have set bonus on level 45 gear now, which really doesnt make any sense. In any case we will wait and see.
Except that level 50 gear is end game gear for those who don't buy RotHC. Every MMO I have played that introduced a level increase did not remove any set bonuses on the prior end game gear.
There is absolutely no logic that only end game gear should have set bonuses.