Dead Island: Epidemic is now in early access on Steam, and since the multiplayer hack & slash arena is a free-to-play game, this is an open beta for all Steam gamers. Here's a new open beta trailer and this page has all the details on what's new at this stage in the game's development. Here's word on what's new: :

All-New PvE-Mode: Crossroads
Crossroads enrichens the PvE experience in DI:E. It offers a bigger variation, higher replayability and more challenge, regardless of skill level. Both beginners and veterans get access to a mode where they canhave a lot of fun while at the same time unifying the game experience across both PVE and PvP.

Progression System Overhaul
Levels for individual characters have been removed: There is now a global character level that applies to each character and unlocks apply to each character once you reach a new level.

Crafting Overhaul
Weapon leveling and workbench levels have been removed and a new loot-based weapon modification has been introduced: As they complete matches players can now earn weapon modifications (which are divided into rarity: common, uncommon, rare, epic and legendary) which offer progressively more powerful and unique gameplay altering perks.

Passive Skills
Character weapon expertise has been removed and instead every character now has a unique passive ability.

Loot System Rework
Smarter drop system has been added which ensures more guaranteed drops and less randomness.