ESPN, Fox and Warner Bros. Discovery announced plans on Tuesday to launch a sports streaming platform in the fall that will include offerings from at least 15 networks and all four major professional sports leagues. A one-stop app to view most sports should be a welcome sight for fans, who continue to navigate rising costs by subscribing to multiple services. The three companies will each share one-third ownership in the joint venture. A name for the service and pricing will be announced at a later date.