The same team that's worked on the movies will be working on this and they can run at the same time. You can follow different assassins throughout the season. Wick is only most likely making a cameo or maybe random appearances every now and then. The amount of characters that you can put in Wick won't be necessary to carry it.
Show will be set after John Wick 3 though may feature flashback episodes of historically significant hits like the Kennedy Assassination. May also be developed into an anthology series of sorts with each season featuring a different Continental Hotel in a different city. They've got a lot of potential mileage including guest stars and guest directors doing one off episodes that don't need to tie into John Wick personally but will establish the lore and mythos around the world of international assassins and how their order has evolved over time. The idea has been cooking since the development of John Wick 2 and Atomic Blonde, the only thing that seems somewhat of a conflict is the Hitman TV series which will also be written by Kohlstad. Seems like competing franchises with the same people involved and one will inevitably suffer as a result. I personally hope they get Vincent Cassell and Jean Reno if they get round to Le Continental in Paris, they could even film it at the actual hotel of the same name there, maybe reveal their wine cellar has a secret wall to a gun vault or to the Catacombs or something.
I'm not even excited now they are going the Limitless route rather than with the original concept but I get Hitman and John Wick are both likely to be on the same slate in terms of release for TV and perhaps they don't want them to seem too similar. I can see them getting McShane since it doesn't look like American Gods season 2 looks likely at all now and once he's done the Deadwood movie he'll have time free.
