During BlizzCon last weekend, Overwatch Game Director Jeff Kaplan spoke in several different interviews about the possibility of cross-platform play coming to Overwatch.
In an interview with Eurogamer, Kaplan said his team was excited with what they had seen other games do with cross-play, "We're super-excited about what's going on with cross-play in all sorts of different games, from Rocket League to Fortnite."
Kaplan said the Overwatch team is, "constantly in discussions with the first-parties, Microsoft and Sony, to see where they're at and gauge where their temperature is at."
In an interview with moderators for Reddit's Overwatch subreddit, Kaplan said what Fortnite did with crossplay was huge. "Fortnite’s been a real breakthrough, and I hope everybody realizes Fortnite fighting the battles they’ve been fighting benefits all players throughout the world."
But he also acknowledged the challenges that come with trying to implement cross-play. "It's very complicated - from a technology standpoint, a game design standpoint, and from a business relationship standpoint. But we would be excited to tackle all of those challenges; we would love to try," Kaplan shared in the Eurogamer interview.
So it seems like Overwatch cross-platform play is certainly a possibility, but when players could expect to see the feature is still probably quite a ways away.
Kaplan also revealed Overwatch's newest hero: Ashe, during the BlizzCon opening ceremony, and in a Developer Update on November 5, informed players she would be coming to the PTR that same day.