J'ai trouvé ces infos sur les différents events (en VO): marre de chercher à chaque fois !
1. Odin's Bounty 
Bosses will drop Chests of Odin's Bounty. These chests are loot boxes that you can collect and then open later for an epic lootsplosion! Chests of Odin's Bounty have a high chance to contain Runes and Odin Marks, as well as a chance to drop the Mysterious Crimson Box, which contains rare boss-specific artifacts. Odin's Bounty Boosts are back as well and include a jackpot chance! Green Bosses drop 1 chest, Red Bosses drop 2 Chests, and Cosmic Bosses drop 3 Chests.
Additionally, everyone has a rare chance to receive Odin's Blessing, which gives your chests special jackpot loot! Odin's Bounty Potions have been known to increase your chances of receiving Odin's Blessing.
2. Mystic Mayhem
Mystic Mayhem is an event for Marvel Heroes 2015 that takes place in the Infernal Limbo Zone. It’s born out of the necessity to ensure N’astirh’s invasion of Earth does not succeed and the demon’s base of operations in Limbo is shut down.
Infernal Limbo - A new game mode only available during Mystic Mayhem that sends players into Limbo to defeat the Demon Lord N’astirh!
Legendary Mystic Scrolls and Double Legendary Mystic Scrolls - Items that can drop anywhere giving you some of the best loot in the game!
Asgard Supports the War Effort - Higher chance for rare runes to drop anywhere in game.
Experience Counts - 63% Experience Boost.
Finding Items - 63% RIF/SIF Boost.
New Mission: Strike on Limbo - Speak to Magik in the X-Mansion for a mission that grants you 3 power points and +63 permanent health bonus!
Mystic Mayhem Invades - Demons from Limbo have invaded Midtown Manhattan Patrol!
Mystic Achievements - A new mystery achievement will be added each time the event goes live, and if players solve it before the end of the event, the 63% XP/RIF/SIF buff will last an extra day, overlapping with the next event!
Achievement Mayhem! - - Mystic Mayhem has its own set of achievements for you to earn!
Mystic Mayhem Boxes
For the duration of Mystic Mayhem, the rare 10-drop Eternity Splinters will be joined on all loot tables with Bundles of 63 Eternity Splinters.
The drop rate of the 10-pack bundles will also be doubled for the duration of Mystic Mayhem.
During the full duration of Mystic Mayhem, Hero Tokens can again drop anywhere in the world, in and out of Limbo, from any enemy.
New Artifacts Such as, Mayhem Demonblood, Sharabus Neotum, and Bloodstone Demonband.
3. A.R.M.O.R. Incursion 
A.R.M.O.R. Defender Mission - Completing this mission will grant an Ultimate Upgrade Token!
A.R.M.O.R. Drives - Collect Intel Powerup buffs, defeat the specified boss, and earn A.R.M.O.R. drives.
New Items & Artifacts - Now you can use your A.R.M.O.R. drives to buy more items and artifacts, including Howard the Duck's Big Freaking Gun.
New Enchant Recipes - A.R.M.O.R. drives can get you all-new enchant recipes for slots 1 - 5, featuring the new Alternate Reality Rune.
A.R.M.O.R. Incursion Achievements - 7 new achievements are now available, exclusive to A.R.M.O.R. Incursion!
100% Server side XP Bonus - throughout the A.R.M.O.R. incursion event.
4. Cosmic Chaos
Cosmic Bosses Drop Double Loot - All cosmic Terminal bosses, every time.
42% server-side multiplicative boost - to Rare Item Find, Special Item Find and Experience for all your heroes.
Cosmic Prestige Doubled - Doubled leveling rate for Cosmic Prestige during Cosmic Chaos week.
Cosmic Doop Double Spawns - Midtown is more dangerous, with twin Cosmic Doops visiting occasionally.
Cosmic Doop X-Defense - Cosmic Doops can and will appear in Doop waves of X-Defense.
Cosmic Doop Simulation - Cosmic Doops can and will appear in Holo-Sim rounds 5 and higher.
Doop Rune - A new rune that can be found during Cosmic Chaos.
Cosmic Chaos Supplier: Moondragon - Moondragon will exchange Cosmic Worldstones for a variety of items.
5. Operation Omega
Omega-Level Server Buffs - 24% server-wide boost to SIF, RIF, and XP which stacks per day!
Omega-Level Threat Enemies - chance to spawn harder enemies and more loot.
Faster Omega Leveling - by 24%, to be exact.
Daily Double Omega Orb Shared Quest - your 1st daily Shared Quest gives you double Omega Orbs!
S.H.I.E.L.D. Omega Access Files - awarded for logging in and completing missions.
Operation Omega Exclusive Items & Artifacts - for enough Access Files, S.H.I.E.L.D. Agent Dum Dum Dugan has these on hand.
Agent Coulson Mission - Agent Coulson offers a mission during Operation Omega week. Each day, you can complete five or more waves in the S.H.I.E.L.D. Holo-Sim to receive a reward from him.
Omega Drive - During the event, any enemy can drop a powerful artifact called The Omega Drive.
Sujet: Re: Marvel Heroes. 
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