If you read the update from last week Bungie said the only way to get the updated legendarys is to open packages. You may as well decrypt the legendary engrams
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But a few cryptard packages will net you new stuff. I am saving mine just for that reason. To lvl the cryptard after the update!
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Think it's more about hoarding exotic engrams......but yeah, saving legendary engrams won't get you the new stuff, but it may be at higher light when decrypted after the update.