This is, however, only available while the game is in the Game Pass catalog.
“In addition, all Xbox One games in the catalog – and related add-ons – will be available to purchase at an exclusive discount for Xbox Game Pass members, so you can make the games you love part of your permanent library to play whenever you want.
Xbox Game Pass offers timed access to a library of Xbox One and Xbox 360 for £7.99 / $9.99 a month.
Where it differs from Sony’s streaming service PS Now is users can download each of the games in the library directly to their Xbox One. “That means continuous, full-fidelity gameplay without having to worry about streaming, bandwidth or connectivity issues,” says Microsoft’s Phil Spencer.
UPDATE: Despite previously saying "Xbox Game Pass will only be available on Xbox One and Windows 10 devices," Microsoft has clarified the Xbox Game Pass service will not be coming to Windows 10 PCs.