It looks like Battlefield V's long awaited entrance into the Battle Royale genre is coming soon and it's called Firestorm! A video has leaked demonstrating the mode, and it has a lot the things you'd expect from a Battle Royale. There's vehicles, weapons with different rarities, backpacks, and if you are downed you can still fire a sidearm to potentially save yourself and allow for your teammate to pick you up. Learn more about it with this video:

A bunch of other details have been revealed in a datamine from temporyal on Reddit:

"Do whatever it takes to survive. Compete solo or in a team to be the last one standing in a vast and dangerous world. Scavenge for supplies, outrun the Firestorm, and fight your way to victory."

(snippet: ID_SPARTA_CASABLANCA_ROYALE_DESCRIPTION)

General info and game mode start

• three variants: solo, duo (2 player teams), squad (4 player teams) with a player maximum of 64 per match
• typical Battlefield classes will be present / choosable (snippet: ui/shared/widgets/classinforenderwidget)
• code shows signs of an LFG system and "backfilling" entries
• will have a separate ranking system
• will (probably) occur in Tides of War - at least the code for a connection is already there
• takes place in Norway (snippet: "/sparta/casablanca/royale/dk_norway-bd00e4f9.png" - also the level name itself contains the word "norway")
• you parachute from a plane into the war zone (snippet: Paradrop_Exit)
• your hud will show an altimeter during the free fall / flight (snippet: ui/ingame/hud/widgets/parachutealtimeter)

Gameplay

• if you get shot by an enemy you enter a "downed" state where you can crawl (but probably not fight) (snippet: DownedState_Crawl_LEFT_3)
• there are various hints to a 3rd person camera angle but they are always tacked to the parachute start or when you get downed / killed
• you have an inventory where you can store loot you find (snippet: UI/Ingame/Hud/Minimap/Inventroy - btw the typo is directly taken from the code)
• loot has four types of "rarity" (snippet: ui/rarityselection; UI/s/HUD/Loot/RarityOne, UI/s/HUD/Loot/RarityTwo, ...)
• you can find better backpacks (three tiers) to extend your inventory
• the map features safes that can be opened (this will be tracked in your stats) (snippet: safesOpened: w(t.royale.safesOpened, 0))
• there are dynamic objectives on the map which you can capture (e.g. "resupply points" as mentioned later)
• dynamic objectives may also be connected to "lockups" / "vehicle breakouts" mentioned in the code (snippet: w(t.royale.vehicleBreakoutsOpened, 0))

Weapons

• weapons will categorized in tiers (1-4 can be found, 0 may be some kind of start equipment)
• the HUD can feature six types of ammo: LMG, Pistol, Rifle, Shotgun, SMG and Sniper (snippet: ui/images/hud/ammo/ammo_lmg)

Weapon Specializations (probably not complete, just the snippets):

• Meta/SpecTree/Primary__Bayonet
• Meta/SpecTree/Primary__Bipod
• Meta/SpecTree/Primary__DetachableMag
• Meta/SpecTree/Primary__ExtendedMag
• Meta/SpecTree/Primary__FastBullets
• Meta/SpecTree/Primary__HeavyLoad
• Meta/SpecTree/Primary__IncendiBullets
• Meta/SpecTree/Primary__QuickADS
• Meta/SpecTree/Primary__Slug

Healing and Armor

• you can find / use bandages and medic bags (small and large) (snippet: s/Meta/Gadget/Medical_Supplies_smallmedpack)
• healing probably takes some time (snippet: MedicBag_Apply_Sequence)
• there are three named tiers of armor vests (snippet: UI/Textures/Icons/HudArmourVestTier1, ...)
• there is a kind of special "armor plate" without any tiers (sounds like very strong armor loot?) (snippet: UI/Textures/Icons/HudArmourPlate)

Vehicles

• various HUD elements give away that vehicles use fuel as a resource and therefore can't be used without limits (probably for balancing) (snippet: ingame/hud/widgets/fuel; gameplay/schematicchannels/sc_vehiclefuel)
• you can get vehicles by opening "vehicle breakouts" (probably the stronger ones...tanks?)
• the tiger and the valentine are (until now) the only tanks I could find with a direct connection to Firestorm
• other vehicles: "Halftracknomag", "Kubelwagen", "Kettenkra", "MH101ctor" (snippet: LaVEH_Halftracknomag)
• one interesting air vehicle snippet: "/Core/Vehicles/Air/VEH_plantuka_AI" - could be an AI controlled Stuka (plane + stuka = plantuka?) as a reinforcement

There is a number of "blue prints" for other vehicles (could be found by opening safes? I don't know...):

• Helicopter (yep!)
• StaffCar
• SportsCar
• Schimmwagon
• PickUpTruck
• Tractor (probably the famous "MH101ctor" mentioned above and seen in the mini teaser)

Reinforcements

• you can unlock and call in reinforcements (snippet: /gameplay/reinforcements/reinforcement_unlocks)
• the following are present:
• Artillery Strike (snippet: Meta/Reinforcements/ArtilleryStrike)
• Vehicle (snippet: Meta/Reinforcements/r_vehicle)
• Danger Zone (any ideas?) (snippet: Meta/Reinforcements/r_dangerzone)
• Supply Drop (snippet: Meta/Reinforcements/r_supplydrop)
• Strafing Run (maybe done by the AI controlled Stuka mentioned above) (snippet: Meta/Reinforcements/r_strafingrun)
• V1 Rocket (snippet: Meta/Reinforcements/r_v1rocket)

Statistics

Personal profile:

• "soloWins"
• "duoWins"
• "squadWins"
• "totalDowns"
• "totalKills"
• "meleeKills"
• "totalTimePlayed"
• "totalRevives"
• "totalHeadshots"
• "optionalObjectivesCompleted"
• "safesOpened"
• "supplyDropsOpened"
• "vehicleBreakoutsOpened"
• "sulisObjectivesTaken"
• "vehiclesDestroyed"
• "totalTanksDestroyed"
• "totalVehicleKills"
• "roadkills"
• "vehicleWeaponKills"
• "averageKillsPerGame"
• "healingDone" (snippet: ID_SPARTA_CASABLANCA_ROYALE_CAREER_HEALING_DONE)

End of round:

• damage
• downs
• gadgetKills
• headshots
• healingDone
• kills
• meleeKills
• optionalObjectivesCompleted
• resupplyPointsCaptured
• revives
• roadkills
• safesOpened
• supplyDropsOpened
• tanksDestroyed
• timePlayed
• vehicleBreakoutsOpened
• vehicleKills
• vehicleWeaponKills
• vehiclesDestroyed

Comparion screen:

• "score"
• "kills"
• "playersDowned"
• "longestHeadshot"
• "teamKills"
• "squadRevives"
• "timesRevived"