During the reveal they shed light on that. For now, keep your Exotics in your inventory. Once the blueprints are implemented, your inventory will be "scanned" and take all of the current Exotic you have into account. Then you're free purchase the blueprint of an Exotic you have had.
Edit: Mark Noseworthy elaborated the same thing on his Twitter feed. I will provide a link after I run the NF.
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Greatly appreciated, though it would seem there are some armors I will have to re-obtain. I use to delete exotics as soon as I got a better one I liked.
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I'm in the same boat, my friend hahah. Gotta nab a few more deleted ones (Apotheosis Veil and Pocket Infinity) and I'll be set.