The MLN Arcade page gives the following information about the game:
Haul Arcade Game
This My LEGO Network Arcade game requires some heavy lifting! Create a mind-bending platform puzzler for your friends to play through. Place gates, triggers, bricks and ladders to make your game unique. Coming Soon.
How to ObtainEdit
No one knows when the Module will be released. All that is currently known about Haul is that it will be obtainable on Grok's page.