We have heard nothing about the catalysts but Luke Smith I believe it was said something about the exotics being reintroduced elsewhere somehow. Probably going to do what they did with the old season pass exotics using cyphers and Rahool.
The exotic cyphers have a use, they let you get another engram at Xur for a chance at another roll on a random exotic. Now you can argue that isn't a good enough usage but it is there.
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It should let us vets CHOOSE which exotic armor to get from the engram. I spent the last 3 seasons trying to get a nezarecs sin with stats over 60 and with int, disc, rec. Never had 1 drop for THREE SEASONS!! Even grabbing the engram every week. It was an important part of my build for slovabomb and I COULD NOT get a drop. Finally got it the other night from a master NF though.