Regina said a few days ago that Hero Battles and Team Arenas would be removed from Guild Wars this week and that the Sealed Deck/Codex Arena would be added. It looks like the Live Team took care of that, made a few more PvP tweaks, then turned their attention to heroes and henchmen. Our sometimes-trusty sidekicks got quite the makeover. Nearly 70 henchmen skill bars throughout every campaign plus Eye of the North were rebalanced, and the AI for nearly every class of hero, henchman, and Hard Mode NPC was updated. (The AI on Necros and Dervishes got a pass - apparently they used their skills well enough to be left alone.) The full list of changes can be viewed here.
The Underworld got some attention too, fixing bugs, streamlining things, adjusting spawns and adding the ominous statement "Something stirs deep in the Underworld, slowly making its presence known." Hopefully we'll find out more about that something when the Halloween events get into full swing.
For now, we're going to find out if removing Healing Touch from Alesia's bar has taught her that she's not a frontliner.