more info:
1) To upgrade current exotic gear/weapons to be inline with the new light level/damage, you must visit Xur and hope he's selling the item you want to upgrade, exchange said item, give him an exotic shard, pay him 7k glimmer, and you'll receive a new piece of exotic armor/gun. When doing this, ALL of the stats and perks will be reset. you MUST re-upgrade it. 2) Ascendant materials WILL NOT upgrade Crota raid gear. This gear will have its own materials (radiant materials). Additionally, ascendant materials will ONLY upgrade "regular" armor (non 32 light armor) and weapons. 3) Eris will allow you to exchange radiant materials for one another (not ascendants for radiants). 4) The loot raid drops for Crota’s End have been refined from what we experienced in the Vault of Glass. Specifically, the game will pay closer attention to the drops you’ve already had, as well as how long it’s been since you get a “fun” drop. 5) Hard Raid for Crota's End will not be available until January. 6) We can't get primary raid weapons via Crota's End until the Hard Raid launches in January. 7) Buying new purple items now requires that you gain crucible or vanguard commendations. This reward is provided when you hit a new reputation level, and arrives via the postmaster.