I just played after the update, it was hard to find updated servers, but after a while I've found a few.
Ok:
The tp and dispenser upgrade kick ass, dispenser is as resistant to sappers as a turret and gives 60 ammo each time. TP on lvl 3 take 2-3 seconds to recharge->bad news for the defense on first part of Goldrus.
Changes in Goldrush: one huge change that completely changes the gameplay. In the second part of the first stage the ledge on the left is now covered and only accessible from either inside or by soldiers/demos, which sucks for red since that was one of those places that really helped you to defend in the second. Summed up with lvl 3 teleporters it's almost impossible to get in control of that vital point, and even if you do manage to put a sentry up there it won't help much since you'll be fairly vulnerable to demomans and spies.
Spy cloak recharge when picking up ammo: I'm in heaven

you can be virtually invisible all the time, if you hook up to a lvl 3 enemy dispenser

, Spy just got himself a real upgrade, now he's great to play even if you plan to live longer than 20 secs.
So from all of the updates so far, I think I'm most pleased with this one

(except for the class updates)
But I hope that they'll make possible for players to erase achievements without losing the new weapons...
Yesterday I got the "FYI I Am A Medic" I thought I had done months ago O_o i was surprised...