Things I can recall from the Stream…
Double Vault space
Cosmetics(shaders, emblems, ships and sparrows) have been moved to their own kiosks, they no longer take vault space.
Any cosmetic that you have earned can be pulled from the kiosk, even if you have dismantled them, you can always get them back.
Shaders that you earned are removed from the loot pool, giving you a better chance at the ones you dont have.
Exotics Blueprints work the same way as the Cosmetic kiosk. Any Exotic that you acquired will grant the blueprints, so you will always have access to it, even if you dismantled it you can retrieve it from the kiosk.
Some old Exotic weapons and Armor will have a “year 2” version with updated perks and higher attack ratings. Suros Regime, Red Death, Bad Juju and Light Beyond Nemesis were shown with a year 2 version. These year 2 versions also have a higher damage stat. The year 2 Suros Regime was black and red.
Light is now the average of your Attack and Defense.
You can dismantle a weapon to increase the attack value of a weapon you want.
One guardian had a sword on his back
Marks are now one currency. You can only hold 200 at a time, but the weekly cap is gone, you earn as many as you want.
There will be 5 weekly Crucible quest bounties. If you do all 5, you get a nightfall level reward.
Cryptarch sells purple engrams, they cost marks.
Faction packages will always have a legendary item in them.
Class items and Ghost shells have a defense rating. they also have perks like increased rep gains, material radar and increase your Intellect/Discipline/Strength. Shells sold by Lord Shax had perks that gave you glimmer for killing a certain character class in pvp.
Armor can have perks that give better defense against elemental damage.