I didn't notice anything in the news feed that stated we had access to RoI weapons yet. However, I just played a match with someone who ALREADY has an exotic sidearm called the Trespasser! So not only do players who preorder get an exclusive Gjally and Sparrow, but they already have access to RoI gear as well? Wth???
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It's an accident. I think coders were adding Rise of Iron stuff to Taken King content until they noticed later on. So rather than fix it ( their engine is a nightmare to work with) they just left in.