It goes as such:
Prison of Elders is reworked and light leveled-up to the new light cap. Starting at the lowest light arena, you get "taken" VoG gear. Then "taken" crota gear, so forth and so on. And at the highest level, "taken" versions of any of the raid gear drops at the highest light, randomly. This includes weapons.
Have a good day with this knowledge in mind.
EDIT: I cannot post my source, when April comes you will see. Thank you.
EDIT EDIT: Keep discussing, guardians. April Update will show this to be true.
Edit #3: For all the naysayers: you have an opinion, fair enough. Let the update show you. Make sure to Necro this post and look at how doubtful you were.
FINAL EDIT: What Urk said does not invalidate this. I said it means that gear drops in updated PoE, which isn't the old raids.
FINAL FINAL EDIT: Looking deeper, Urk claims old gear won't return. But wasn't Darkhollow and "Harrowed" Darkhollow gear listed as completely separate? Do keep that in mind.
LAST MINUTE UPDATE: The new strike, Blighted Chalice, will be in the Hellmouth and involves Fallen who have mistakenly freed Malok, whom we all know from the Hunter legendary helmet listed in the armory.
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Urk has already said nothing about the old raids is coming in the update. I don't think the taken guardians are gear or shaders for us, rather it makes more sense that they're the new enemy type in PoE. Some of the guardians who invaded the dreadnaught were taken and we've captured them in the prison of elders where we will go fight them.