For those of us leveling alts, Blizz hotfixed xp form killing mobs in invasions and the numbers are huge.  Some Semi-bosses give now as much XP as the stage itself.

 

YOU MUST PARTICIPATE ON KILLS, SPECIALLY BOSS KILLS, FOR THE INCREASED XP!

http://us.battle.net/forums/en/wow/topic/20748605651?page=222#post-4421

“Hi all,

Just to further confirm – this hotfix is being pushed now and should be live within the next hour.

Please note that if you are participating in an invasion when this goes live on your realm, you may see your invasion “reset”. This is intended with this fix going live.

Thanks again for all of your feedback, and please let us know if you encounter any issues!”