Here are the names and rarities of all of the Fortnite Skins and other cosmetics that were added in he v12.40 update.
In major Fortnite updates that require some downtime, new files are added to the game. These files usually contain cosmetics, weapons and challenges that will be coming to Fortnite Battle Royal in the upcoming weeks.
There were quite a few Fortnite cosmetics that were leaked in the v12.40 update, which included Skins, Back Blings, Gliders, Pickaxes, Emotes/Dances, Wraps and a Contrail. The majority of these cosmetics will feature in the Item Shop where players will be able to purchase them for V-Bucks.
Here is a list of all the names and rarities of all the cosmetics that were leaked in the Fortnite v12.40 update.
FORTNITE LEAKED SKINS FOUND IN V12.40
Cable (Marvel) – Seasoned soldier and master battle strategist

Domino (Marvel) – Make your own luck

Psylocke (Marvel) – Telekinetically enhanced master martial artist

Synth (Epic) – Often duplicated, never defeated

Guff (Rare) – Don’t fluff with Guff

Siren (Rare) – Unforgettable and inescapable

Wolf (Rare) – He’s the one you call when all hope is lost

FORTNITE LEAKED BACK BLINGS FOUND IN V12.40
Cable Cloak (Marvel) – Always ready for trouble

Domino Pack (Marvel) – Luck is always on your side

Shurayuki (Marvel) – Forged a thousand years ago

Stellar Jaunt (Epic) – Ready for anywhere

Back Scratcher (Rare) – Always on the beat

Fluffle Bag (Rare) – Jam-packed with sparkly shards

Last Kiss (Rare) – Sealed with a kiss

Pelt Pack (Rare) – Heavy-duty furry battle bag

FORTNITE LEAKED Pickaxes FOUND IN V12.40
Probability Dagger (Marvel) – Beat the odds

Psi-Blade (Marvel) – Focus on the blade

Unstoppable Force (Marvel) – Whatever it takes to survive the fight

Light Knives (Epic) – Dazzlingly sharp

Regal Floof (Rare) – Give ’em some guff

XO Axes (Rare) – Kiss your target goodbye

FORTNITE LEAKED Gliders FOUND IN V12.40
Psi-Rider (Marvel) – Harness the power of telekinesis

Flux Flier (Rare) – Reality is always in flux

FORTNITE LEAKED Emotes FOUND IN V12.40
CrazyBoy (Icon Series) – Never forget your pure heart and fight on

Dynamic Shuffle (Icon Series) – I know the moves!

FORTNITE LEAKED Wraps FOUND IN V12.40
Banner (Rare)

Blue Shock (Rare)

Frosty Glow (Rare)

FORTNITE LEAKED Contrail FOUND IN V12.40
Synth Streak (Rare) – Synthesize your dive

There are quite a few Marvel cosmetics that have been added in the v12.40 update and we do know that these cosmetics will be available as a bundle, which you can read more about here.
Unfortunately, there is no way of knowing when these cosmetics will be available to purchase until they are released. Which items, if any, will you buy once they are available in the Item Shop?