Apparently there was a bunch of hidden pages in addition to the medals but I still haven't found the links on the teamfortress page. I only found them by searching the web.
http://www.google.com/search?q=site:http://www.teamfortress.com/classless/hidden/&hl=en&filter=0
Also here's my opinion of the changes so far...
The Good...
The running away animations.
Improved critboosted visuals.
Teammates no longer block friendly radius damage. Prevents nearby teammates causing rocket/grenade jumps to fail. (I hope this doesn't turn out like allowing the sniper to be able to shoot thought his teammates).
Many bug fixes (always good).
New hats.
Right click to throw the ball and left to bat. My only question is why Valve did not do this at start as it is extremely obvious. Maybe they where afraid holding the ball in reserve would make it too powerful idk???
The Bad...
Source mod is now broken.
The spy gets the shaft again... with Engineers being able to repair their teleporters by hitting the other end. I mean when you sap the entrance you want to get as far away as possible before some someone comes out. Now an Engineer will be able to prolong the time it takes to kill a teleporter thus making it easier for the enemy to come out of spawn and kill you.
The scout sandman debuff change from no double jump to less hp. I mean the scout has low enough hp as it is and I kind of thought the entire point of using the sandman/fan combo was to compensate for the lack of double jump. I mean I thought they where originally created to be used together.
Hats which will apparently only be gotten by people who want to idle on servers all night. Don't get me wrong I like the addition of new hats it's just useless to me until Valve puts in a way to earn one legit because they aren't dropping for me and I play tons. When/if one does drop with my luck I'll get the one hat I don't like, the heavy's football helmet...
In addition...
Capturing the flag in a CTF game mode gives the entire capturing team 10 seconds of critboost. I guess this is to break stalemates but I am wary of how this will work.
The majority of the "update" seems to not be in new content but in gameplay, small feature additions and bug fixes. The only actually new content seems like the running away animation, one map and the hats. I had actually already played koth and Yukon before the update. The update is not bad but it doesn't seem like a full featured update.
I also kind of find it odd that Battlefield Heroes gave away medals to wear to it's beta players not two months ago and now Valve gives away medals to wear. I guess it's fair enough seeing all the things BF heroes seems to copy from TF2.
Edit: Ok I looked in the sdk and the new hat models are...
Demo = Scottish hat (its a Scottish style hat, IDK what they are called, but they are frequently worn with kilts)
Demo = Top hat (seems like it should be for the spy not the demo IMO)
Enigineer = Cowboy hat
Engineer = Train hat (like the ones engineers in trains wear)
Heavy = Stocking cap (its a winter style stocking cap)
Heavy = Ushanka (the Russian military hat as seen on Teamfortress.com)
Medic = Mirror (YES the doctor headpiece I said they should add!)
Medic = Tyrolean (Bavarian hat I've seen worn with those green overall shorts they wear)
Pyro = Fireman Helmet
Pyro = Chicken (it's really a glove on his head, epic

)
Scout = Bonk Hat (Beer hat with bonk in it. YES another hat I suggested!

)
Scout = Newsboy cap (paper gov'ner?)
Sniper = Jarate Headband (it's a yellow headband)
Sniper = straw hat (its a white looking hat)
Soldier = a pot (yes it's a cooking pot

)
Soldier = Viking helmet
Spy = Derby hat
Spy = Camera beard (From the fake spy update items, made real. I kid not

It doesn't look like the spy beard adheres to his face as much as hangs around it)
Other than the Demo's top hat they all seem appropriate. Guess I'll have to wait for my Heavy Zangief beard and mowhawk some more...