May 2018 Games with Gold includes MGS: Phantom Pain, Vanquish and more

It looks like the Xbox Games with Gold list for May 2018 has been found a little early. According to this unlisted video on the Xbox channel which is more than likely official The Witness will be coming back to the lineup with a new comer like Metal Gear Solid, Vanquish, and more.
For Xbox One:
Super Mega Baseball 2 will be free all month from May 1-31.
Metal Gear Solid: The Phantom Pain will be available from May 16 until June 15.
Xbox 360:
Sega Vintage Collection: Streets of Rage will be available from May 1-15
Vanquish will be available the other half of the month from May 16-31
Watch announcement video below: