Bless those handsome devils at Valve!  Looks like the Demoman is nerfed a little, and spies (I hate them so much!) and engies get a little boost.  Here are the official changes (I’ve bolded the ones I found interesting):

• The Engineer’s teleporters can now be upgraded to level three. It will recharge faster the higher level it is
• The Engineer’s dispensers can now be upgraded to level three. It will give out metal and heal faster as it is upgraded
• Spies will be able to recharge their cloaking ability by picking up ammo off of the ground or from health cabinets
• Some changes to the second part of the first stage of Goldrush to give the attackers more of an advantage
• Any weapons that fire bullets (shotguns, sniper’s machine gun, heavy’s minigun, etc.) can now break apart the Demoman’s stickybombs
• The icon on the HUD for a person calling for Medic will now give more information to the medic (if the target is low on health, on fire, etc.)
• Added an achievement tracker that will allow people to choose specific achievements that they are trying to get
• There is now a custom icon for death messages when the player was killed from a critical hit
• Added a new particle effect for when a player enters the water
• Added smoke to the feet of a rocket jumping soldier
• Players will now have some particles swirling around them so other players can see when they are overhealed

Kudos to the guys at Valve for sneaking a nice little update in.