The characters' skill trees seem to have changed in terms of their order and additions.It seems that items that were once exclusive in Dead Island are now part of the vanilla content in DIR. Bad netcode may cause a throwable to be thrown at one's feet to other players while otherwise acting normally to the thrower.Desynch causes one of the players involved in the desynch to have their own set of enemies. The desynchee will otherwise play normally, not being able to tell that they have desynched until they must enter a red ring where all players must gather, which becomes impossible. Their body continues to perform some last motion, like running continuously into a wall or idleing. Desynch is when in one person's game, another player character does not move properly. Seems to occur consistently if not-the-host operates a vehicle. There's an option to import characters, but it doesn't seem to import items.There don't seem to be developer's craft weapons anymore.The four original characters return + one new character: John Morgan, the hand-to-hand specialist.There are new types of ammo: harpoon, taser/stun gun, nailgun, and launcher.