Bungie's bringing back a couple of year one exotics in the December update, for example, MIDA, Plan C, and Nothing Manacles just to name a few. Also, shotguns are getting nerfed pretty badly, along with other changes. Auto rifles are getting a small base damage increase. Pulse rifles are getting a base damage decrease, and hand cannons are getting an ADS (aim down sights) accuracy boost. Some exotics have also been changed. Hawkmoon is gettting a range decrease. Black Spindle is getting its scopes removed, and they will be replaced by ballistics upgrades. The Chaperone is getting a damage decrease, (as are all shotguns) but its precision damage is getting a considerable boost. There are a couple others, just read the weekly update if you want to know. TL;DR: Quite a few exotics are getting changed, and weapons are being buffed and nerfed all across the board.