If there is a battle royale mode it will be dead within months or weeks since Firestorm was such flop and the market is already flooded with battle royale games at this point. Focus on rush and conquest and the fan base will be happy.
If they try it again it needs to go for a heavy vehicle and destruction focus.
Vehicles maybe should have to loot as well, maybe cars and debris in the road can have road loot for example
Run over a car with a tank and maybe it has armor plate pickups, ranged sights, chaff grenades
Antenna, satellites, etc on rooftops maybe having air based pickups(for a fighter get for example you'd shoot the antenna which would blow up, rng picks loot and if you get something it floats up into the air on a balloon like a Fulton from Metal Gear)
On foot action will be relatively weak however
- rocket launchers are incredibly week, limited ammo, slow reload, or whatever
+ mines would do something like 90%+ damage on a MBT, tracks can also be detroyed potentially.
+ C4 is less powerful than a mine but can easily be used to target tracks
+ you can throw grenades into open vehicle hatches killing the driver
+ bridges and roads can be destroyed or booby-trapped
+ the map will contain stationary AA guns, missile sites,
and anti-air vehicles themselves
Every soldier carries a rope launcher by default along with parachutes
The crazy old playable Battlefield vehicles like battleships, aircraft carriers and maybe submarines would be playable
Hypothetical map base could be something like Wake Island but massively expanded.
A player taking over a battleship or carrier could even bring back elements of 2142's Titan Mode.
You can hang out at missile sites launching them at it continuously but be at risk from other players coming by,
or you can drive a jetski up to the ship, climb aboard and have to destroy evey door into the control room to kill the driver immediately.
Imagine if they applied the destruction engine/mechanics to stuff like the carrier and you could destroy sections of the hull and sink it or destroy the engines, or the flight deck.