Big difference here. Bungie isn't a 1st party developer anymore chained down to MS's commands. There is no reason for it not to eventually come to PC seeing as how you have a potential gold mine of gamers on here.
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While that is true, I believe they would have announced that a while ago if they wanted to get people hyped
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Need to sell consoles somehow and didn't want to give PC a crappy port *cough ubisoft cough* so they're taking their time on it.