A few friends and I were considering getting Stardew Valley and I have seen that multiplayer was coming to xbox. I have only found confirmation for Switch and PC. We were only going to buy if multiplayer was added.
XBox, much like Vita/PS4 version, is still stuck in the 1.2 era, so no coop mode there. And with how little to no attention the non switch/PC version get ( the Vita version is STILL a crash ridden mess 6 months after its release ! ), I doubt coop will ever be on the box.
It's not out yet, but multiplayer for Xbox and PS4 is being worked on right now and will hopefully be out within the next few months. Here's a tweet from Concerned Ape about it: https://twitter.com/ConcernedApe/status/1091420115785048064
