In 0.9.11 there is no Maelstrom of Chaos. When you complete the (temporary) end of the Beta by finishing Act Two of Merciless difficulty, you will instead be given a waypoint to the Eternal Laboratory. This is an area that you will eventually find in Act Three, but we’re granting access to a temporary equivalent earlier so that Maps can be tested.
In the Eternal Laboratory is a device that allows you to use a Map. The Map is consumed and six portals are created that can be used to travel to the area it represents. The portals close as they are used by players. A party of six players can only enter the Map once and can only leave with six inventories full of items. A smaller group of players will have some portals spare to carry additional items out of the area or re-enter if they die. Players may choose to play alone if they want to use all six portals to complete the area.