A complete rework of at least 3 sub classes
A complete rework of the weapon loadout
An entirely new story
Improved Graphics
4 entirely new locations
A slew of new strikes
A slew of new MP maps
A reworking of game currency
A reworking of multiplayer across the board
LFG systems and Guilds
Friendly AI characters during gameplay
Improvements to how activities can be launched
Entirely new loot
At least 3 new weapon archetypes
+more I'm very likely missing
Aside from the slightly improved graphics (Destiny 1 had great graphics/art direction), the points you've composed all sound like stuff you'd see in DLC (kind of like the Taken King). A lot of these features that they touted were nice QOL stuff, but it's not sequel-brag worthy. Like, "oohhh, we don't have to go to orbit anymorreeee. Isn't this sequel greatttt???" That's what I felt like when I watched the stream.
I platinumed Destiny 1, and I've put in too many hours into the game so, coming from a guy who loved the game, this sequel didn't really impress me too much.
I don't think I was expecting more of what I've already liked about Destiny 1. Telling me that you've got a bunch of new weapons, strikes, and a raid is (duh) expected of Bungie. I was expecting some more information on stuff that I hadn't seen before in Destiny.
Off the top of my head
-Ships. Are they just loading screens again? The Destiny community has been clamoring since day 1 for things to do with your ship other than "equip" new ones to stare at.
-How are they changing exotics other than giving us new ones? Are they still just the carrot at the end of the stick that will keep players playing?
-How is the grind being addressed?
-Can I climb that mountain over there?
-How are sparrows different? Are they just used to get from one public event to the other?
Basically, everything I saw in the stream was nice...but it was expected. It doesn't seem like a full on sequel because it felt more like a progression of what Destiny 1 had established. Which would be fine if they didn't keep saying "We're starting over" "The Tower's gone" "blank slate yada yada"
Hope I made some sense
WITH ALL THIS SAID. I think as more information comes in, my questions may be answered, and I may be way off base because I don't have enough information.