Other (obvious) additions to Destiny 2 are the new subclasses and extra abilities. I'm a Titan main, so most of my time was spent with the new Sentinel class, but I also got to check out the Dawnblade Warlock and the Arcstrider Hunter. All three are similar in a lot of ways to their previous subclass, but with more aggressive tendencies. The Arcstrider is almost identical to Bladedancer, save for the super, which gives you some mad bow staff skills. Dawnblade gives you a flaming sword and the ability to essentially fly around the map as you swing fiery blasts at everyone. That's instead of Sunsinger, which brought you back to life and gave you unrestricted access to all the melees and grenades you wanted. Instead of Defenders and their Wards of Dawn, Sentinels will get a Captain America shield that they're able to throw around and smash into people with. So while I think that the new subclasses are less tactical than the original ones, they grant new and interesting game mechanics to players. The new supers are about taking out as many baddies as you can, and in that case, all three are extremely successful.
It looks like Bungie is also playing with the idea of setting up a more regular competitive scene. The most competitive Destiny game modes have been the Iron Banner and Trials of Osiris, which are both timed events. While this allows for an almost heightened sense of competitiveness during these times, it also sort of makes the down time less interesting, like it has smaller stakes. The Beta has two modes -- one called Quickplay, and one called Competitive. While it's not yet prevalent now how this will affect things, it sounds similar to Overwatch's system. It could mean that Destiny 2 will also have seasons, where you're ranked based on performance, which would be a great addition to the Crucible.
The Cabal play a significant roll in The Taken King, even though it’s not entirely apparent, which helps lead into Destiny 2. Like every alien race before it, the Cabal were planning an attack on Earth, but they were instead interrupted by the Taken. While their operations were put on hold, they believed that they could salvage the opportunity by boarding the Dreadnaught and obtaining some of the Hive’s technology to be used against the Last City. The Guardians were successful in stopping their efforts, but due to their intense casualties, the Cabal ready an even stronger attack against The Last City which is to be seen in Destiny 2.
This is where the Cabal are fiercest, and it doesn’t help that they have also been looking into the Vex Gate, so you will need to get past their forces to make any progress. It's revealed that the Vex are returning through this gate to the Black Garden for an undetermined reason, so like any good Guardian, you follow them through. This is where you will arrive at a very unnerving location as the Vex seem to be worshiping a Black Heart. The final boss of the vanilla game, the Sol Progeny, is summoned to defend this heart, and upon defeating them, light is restored within the Traveller.
The RNG system is still here but has been streamlined to be more rewarding. Faction Leaders regularly dole out Legendary items after you turn in enough Faction currency to them, which can be found by participating in activities in the world, playing Crucible, breaking down old items and participating in Strikes. All-in-all, enhanced loot drops it’s not much of a chore to get to a high Power Level to take part in the late game activities. What has been negatively impacted in Destiny 2 is a player’s ability to customize their Guardian and earn certain rewards.
One day long ago, a gigantic intergalactic sphere called The Traveler appeared in our solar system, most notably making contact on Mars. This mysterious colossal-sized globe was not a world conquering alien, but instead friendly, helping humans accelerate technological advancement dramatically, allowing them to traverse the stars, terraform planets and build towards a better future. This was considered the Golden Age of humanity, even boosting the average lifespan of man threefold. Unfortunately, that prosperity didn’t last long as a deadly and ominous force called The Darkness appeared, destroying anything in its path and nearly tearing down everything Humans had built. This kicked off an event called The Collapse and everything in the galaxy took a toll because of it. The most important and unfortunate casualty was The Traveler itself as, in its last act, protected the Earth with its unresponsive body shielding the newly-built Last City.
Bungie did turn a corner with the laying out of the plan moving forward for Destiny 2, which was a nice gesture, but showing us the content road ahead isn’t what earns trust back ; it’s the work put into Destiny 2. Guardians have been putting in the work of playing the game. Many couldn’t keep up with the grind, but those that stayed see that brighter tomorrow that every NPC is always gabbing about to whichever Guardian will listen.