I only just realized now when writing this that I skipped releasing version a4 (and I don't remember publicly testing it), though that was probably for the better. I've been working on and off this rework for the last while.
Pedestrianized the Middle area, alongside adding a new middle structure (that's more effective at blocking the previously horrific sniper sightlines)
Reworked 'Foyer' areas in the both teams bases, with a new, more direct path to the intel room
Made the stairs from the bottom spawn exit to intel room larger, and removed the adjacent area with a drop-down door to the vents
Added new storage room area connected to the before the previously mentioned stairs and one-way vent exit corridor.
Removed the elevated one-way vent exit to the subway area, and adjusted the clipping around the trains
Added drop-down connection between the upper and lower vents
Connected/merged upper & lower spawnrooms, and added an additional spawn exit
Most areas have been brightened up a bit (most noticeable in the intel room and outdoor subway entrances