http://herald.warhammeronline.com/warherald/NewsArticle.war?id=404

A few things to notice:

Tier 4 zones now require fewer scenario victory points to be captured. The mechanics of capturing a zone have not changed however. Zones which have no scenario opposition can still be captured if players join the queue for scenarios based on that Zone. Victory points towards zone control will be granted if a realm has enough players in the queue to launch the scenario and the other realm doesn’t. If players in those queues join a launched scenario or leave the queue, the victory points towards zone control will be forfeit.

In other words, using “Join All” to queue for all available scenarios is still the fastest way to get into a scenario, but joining the scenarios in a specific zone will have the greatest impact on control of that zone, and by extension the greatest impact on the campaign in that pairing.

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* In response to player feedback, the amount of renown earned from healing players has been increased slightly.