I'd like to see some of the older maps being back on the battle server.
Still missing the map with the tower in the middle which would be charged from 2 sides over bridges, down at the bottom of the tower was water, some ruin-walls scattered across the field and all located in an arena. That was/is an awesome map but haven't seen it back on the battle server since I am back.
Give all those old classics a quick review and put them back into rotation and then go for your project. More variety on battle server map rotation can be easily achieved that way.
Oww, and make some really small maps. Battle server barely reaches 100 players nowadays. Since melee is forced to play in open fields, force cav sometimes to play on foot on small, fast paced maps.