from what I saw or could tell though it seems like you have to buy the newer more powerful versions of your exotics using glimmer/legendary marks. so you have them unlocked but it's not so simple to upgrade to them.
edit: also not all year ones had an upgraded version :(
on the infusions he said you use a more powerful weapon to upgrade the one you want also. so a 190 to upgrade a 180 not the other way around.
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So then how do you get the 190 to upgrade the 180 hmm? Didn't think that one through did ya
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Its base better than the other one when you get it. Lol. Say you find a 180 then you find a 190 or 200. Not all legendary guns are 180 base from what they showed. That seems to be the lower end or lowest
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Its for if you [i]like[/i] the 180 weapon. Then you use that 190 to upgrade that 180.