Apparently it's going to be on Starz.

https://www.google.com/amp/s/io9.gizmodo.com/keanu-reeves-john-wick-tv-series-is-officially-happenin-1822035855/amp#ampshare=https://io9.gizmodo.com/keanu-reeves-john-wick-tv-series-is-officially-happenin-1822035855