Other updates include character activity feeds -- there are now RSS buttons all over your profile that will let you track achievements, items, and other specific character information via RSS. And Blizzard has also built in calendar feeds that will let you output guild and player calendars to Outlook, Google Calendar, or other calendar applications. That means your out-of-game calendars will update automatically if your raidleader happens to change up the raiding schedule. And finally, character profiles have been redesigned and streamlined -- they look a little different with all of these new features. The date on all of these changes actually says January 1, 2010, so Blizzard may have implemented them a little early, but sooner or later we'll see these welcome changes all active on the Armory.
Thanks to everyone who sent this in!
Update: The Armory is offline for maintenance now. These changes were seen in action, so they're real, but as we say above, they're officially dated for January 1st. So they may not be in effect just yet.