You forgot to add Singleplayer to the list. XD
Seriously, we know what's missing.
Some stuff is missing due to the lack of resources, other stuff simply because it's not finished yet and a few things because they just don't work out in a online multiplayer enviroment with up to 16 players.
A few examples...
Dam backzone: much to linear and not enough alternate routes.
If you think Cradle has a bad gameplay with a lot of camping and sniping players, this one would even be worse.
Train: literally just a linear row of rooms.
The only way this could work out is by extending the play area to the enviroment outside the train.
But then the train becomes less important and we'd have another map that is pretty much like Depot.
Jungle: let's face it, source isn't an engine designed for huge outdoor enviroments, so a big jungle with lots of trees and plants would bring it down to it's knees.
Beside that, the original is very linear too, so heavy alternations would be required.
For now, just imagine ge_caves beeing located right under the cuban jungle.
Citadel: has seen at least two custom maps released. One with a complex like style and one with temple/aztec style. If they are fixed for 5.0, there's no need for another version unless it's drastically different from the current ones.
None of these maps were part of the original multiplayer, so they are somewhat low on the priority list.
Of course, if some thirdparty mappers wanna try their hands on any of these maps, they're welcome to.