Reading into the description, the second paragraph highlights “the two critically-acclaimed, globe-trotting single player adventures”. Even the category on the right side of the page states only singleplayer. This pretty much confirms that, at least on the PC version, Uncharted 4 will not have its multiplayer portion ported from the original. As mentioned before, this is the first time the Uncharted series will be made available outside of its home PlayStation platform. The same can be said for the handful of formerly PS exclusives that have slowly made their way to PC. These include Horizon Zero Dawn, Days Gone, and the upcoming God of War. All that being said, Uncharted: Legacy Of Thieves still doesn’t have a release date yet, beyond the vague 2022 window. But as was announced, the game will go live on PC shortly after the PS5 version becomes available. And that is believed to come at around the same time the movie, starring Tom Holland, premiers. (Source: Steam)