Browsing through reddit i found this:
forum-en.guildwars2.com/forum/…any-WXP/first#post2899582
this is aimed mainly for the fight around the bloodlust points, but will of course reward zerg wiping aswell!
forum-en.guildwars2.com/forum/…any-WXP/first#post2899582
Devon Carver wrote:
The build on October 1st is going to add WXP consumables to player kills, which should make a pretty sizable dent in this. It is the case that making the events themselves reward WXP is problematic at best because of how easily they cycle. All that said, we’ll make more adjustments as needed to make this a better place to play WvW. A bonus for kills in the area isn’t a bad idea at all.
this is aimed mainly for the fight around the bloodlust points, but will of course reward zerg wiping aswell!

