I've heard in rumors that PSN and XBL users will be able to play cross-console/cross-company with each other. I do not know if this is confirmed or true but if someone does know, please let me know (preferably a Bungie employee).
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They did try to make it happen. The offer was put on the table, many times in fact. Microsoft didn't want to join in. This has happened in many other cases with many other games as we'll. I support all gaming types in fact I have the sunset overdrive xbox one preordered, and 3 copies of destiny pre-ordered for all of you out there who think I'm just a play station fanboy (1 ghost edition for ps4, 1 limited edition for the 360, & one normal copy for the xbox 1) Do a little research and you'll see the facts. Microsoft is scared of a merger for gameplay.