One of the greatest things that Factions brought Guild Wars is 2 party missions, like Vizunah Square. I really hope to see more in the future. Perhaps, even the possibility to enter a mission with a desired 16 people. Never any more than 16 people in a party; I certainly don't want any WoW raid groups here.
Futhermore, I think it would be valuable to have some sort of health meters for the other allied party, similar to the existing party window. The new window would not require names, but only the other party's health status. This would make it easier for healers to do their job between the parties. And for those people who don't want it, it could be removed similar to the existing window.
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Masters nearly everytime.