Valve's Robin Walker has said on the Team Fortress 2 blog that a new update to the multiplayer shooter is on the way "in the next few days".
The update will bring a couple of extra features for the Spy and Engineer classes. Engineers' teleporters and dispensers will be upgradeable to level 3, while Spies will be able to recharge their cloaking ability by picking up ammo. The update also includes some new user interface features.
"These are just to work on some class balance and depth issues that we've seen in the wild with these two classes, but aren't meant to replace their entire class packs," said Walker. "They will be getting more attention further down the road."
The next class pack proper after this update, however, will be the Scout. Also in the works are an engine performance overhaul bringing in improvements from Left 4 Dead, and a "massive" update to the Xbox 360 version of Team Fortress 2 which will include all the changes made to the PC game in the last year.