This is not news. The armory has shown exotics at max light level 330 since TTK dropped. It's coming at some point, but i highly doubt with iron banner.
It more time gated content that will probably drop in the next big update scheduled for spring.
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And then it'll be super easy to hit 320. -blam!- the struggle and just wait for bungie to make all their previous content obsolete
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Agreed probably be a spring update, since we just got the major update in December that brought more exotics.