From the Kickstarter page:
"Masks is a tabletop RPG about a team of young superheroes forging their own identities in Halcyon City, a megapolis packed with heroes.
If you’re not familiar with the Powered by the Apocalypse system, don’t fret! The full book of Masks will include much more information on playing the game, including instructions for setting up scenes, tips for the Gamemaster, and a more in-depth breakdown of all the important moves of the game. But if you're familiar with Apocalypse World or its derived games, you can try playing right away with these materials."
This Beta PDF document consists of three files, 2 pages of basic moves, 4 pages of GM reference, and 10 playbooks.