After the entire hubbub caused when the reward track was announced the potential XP events were cancelled and the bonuses where integrated in the track, so no, don't expect any bonus xp anytime soon.
"We’ve heard your feedback: higher levels of the reward track just take too much XP to reach. We originally included event reward XP when calculating our intended cadence of rewards. We’ve rethought this and recognize that the rewards track should stand on its own and not require event XP bonuses, making rewards predictable and consistent across an expansion. We will still have in-game events, of course, but they will remain consistent with our existing approach to event rewards instead of rewarding bonus XP for the rewards track."
This expansion will not have an xp event either?
After the entire hubbub caused when the reward track was announced the potential XP events were cancelled and the bonuses where integrated in the track, so no, don't expect any bonus xp anytime soon.
"We’ve heard your feedback: higher levels of the reward track just take too much XP to reach. We originally included event reward XP when calculating our intended cadence of rewards. We’ve rethought this and recognize that the rewards track should stand on its own and not require event XP bonuses, making rewards predictable and consistent across an expansion. We will still have in-game events, of course, but they will remain consistent with our existing approach to event rewards instead of rewarding bonus XP for the rewards track."
https://playhearthstone.com/en-us/news/23585675