EDIT: RESOLVED -- THIS IS THE COVENANT TABLES add-on.
Is this a temporary thing, or blizz trying to push alts closer to the level cap?
I know I've had zero interest in playing alts in SL, as the game is so hollow and empty at the moment. I guess sometime in the 18 months i'll eventually try to get another alt or two to the cap to experience the different campaigns, but i'm in no rush.
With the exception of a handful of garrison missions I don't recall XP being given for the mobile game insert before.