Well, the last three characters in TF2 hat haven't been updated are the Soldier, Demoman and Engineer. So when Valve eventually updates these three classes, what would you like, or think you'd like, to see them get?
For the Soldier, I think something involving his grenades is in order, as he already has them, but just doesn't use them. Maybe a different kind of melee weapon too. His Rocket Launcher is too specific to be replaced with anything else, so it would just have to be a different kind of rocket launcher is replaced.
For the Demoman.......I'm not really sure. He is really a niche' character.
As for Engineer, I think a different construction kit might be in order. Something like a specialty kit, where instead of the teleporters, sentry gun and dispenser, you have something like a radar dish that will highlight all spies, snipers and such in range of the dish on everyone's screen. Something like a barrier device too, where you construct its two ends, and in between them appears a barrier that can't be shot through, but only your team, and spies disgusied as your team can move through.
For the Soldier, I think something involving his grenades is in order, as he already has them, but just doesn't use them. Maybe a different kind of melee weapon too. His Rocket Launcher is too specific to be replaced with anything else, so it would just have to be a different kind of rocket launcher is replaced.
For the Demoman.......I'm not really sure. He is really a niche' character.
As for Engineer, I think a different construction kit might be in order. Something like a specialty kit, where instead of the teleporters, sentry gun and dispenser, you have something like a radar dish that will highlight all spies, snipers and such in range of the dish on everyone's screen. Something like a barrier device too, where you construct its two ends, and in between them appears a barrier that can't be shot through, but only your team, and spies disgusied as your team can move through.