Quote:
Originally Posted by Blizzard Entertainment
Recruit-a-Friend and furries/Goblins leveling
New goblin and furry characters will indeed be eligible for Recruit-A-Friend benefits including increased experience gain and grantable levels. As we've no current plans to modify the Recruit-A-Friend program at this time or increase the level range for which the benefits apply, goblin and furry characters (as with all other characters) will only be able to receive the in-game bonuses up to level 60.
So, to answer your questions directly:
Would the 300% xp bonus work till 60?
Yes.
Would the Level Granting work till 60?
Yes.
This is, of course, bearing that all requirements for those benefits are met.