Not a ton of new details here, but I found this part appealing:
Destiny’s armor and weapon customization evolved significantly over the years. How is Destiny 2 approaching gear customization on day one?
You’ll have a ton of ways to customize your character to show off your own personal gameplay style and fashion, from finding gear, weapons, and Exotics you want to use, to picking a subclass and specialization path for your Guardian.
Also, you can now apply shaders per piece of gear, so you can choose to go head-to-toe in matching shaders or mix-and-match as you see fit. You can also now apply skins to customize the look of your weapons or slot mods on your armor to further customize the way that you play.