A YouTube video uploaded by Bethesda has revealed that Fallout 4 will be free to play this Memorial Day weekend from May 25th to May 28th for Xbox Live Gold members and Steam users. In conjunction, there's also some great Fallout 4 savings on the Xbox, Steam, and PlayStation stores (via ICXM.net)
On Xbox, the free play period and discount run from, Thursday, May 25th at 12:01 AM PT to Sunday, May 28th at 11:59 PM PT. On Steam, the free play runs from 10 AM PT on Thursday, May 25th, until 1 PM PT on Sunday, May 28th. Discounts on the Steam, PlayStation, and Xbox Stores include Fallout 4's base game and Season Pass for up to 67% off.