NBA 2K18 will be a celebration of the glorious and illustrious past of 30 NBA franchises, by including All Time teams for them. These All Time teams will have the best of the best players who have ever played for that franchise, through time, playable in one squad- something that should truly give a thrill to just about any basketball fan.
It is unclear whether the All Time teams will include duplicates (LeBron James, for instance, could feasibly show up on multiple team squads), but it would make most sense to have an all time ‘great’ player show up on all squads he played for (so LeBron would be on Cleveland and Miami, both, as one example).
NBA 2K18 is due out this September. It will be launching on the PS4, Xbox One, Nintendo Switch, and PC (though the Switch version will be digital only at first, with a physical release following later).