Could we have a mode with the only guns being pistols.
Maybe and being limited to a new power weapon being a revolver. As well as the BFB.
Could the maps be like Simulation Faceoff.
In that on one side there are jump pads, the middle is a tight maze with cover and the other is fairly open for movement.
Less about portals and more about movement and momentum, for close combat and melee.
A new map could be that both sides are high and the middle is low, to help slide and momentum. In the air are random blocks that impede vision/long range aim/shots.