Positives;
Improvements to narrative with lengthier story missions.
Second story line unlocks after completion of the main story line and Raid (King's Fall).
Raid-lite mechanics to the 4 (1 PSN exclusive) Strikes, 3 old strikes revamped with Taken.
Introducing more new weapons than Vanilla Destiny/Dark Below/House of Wolves combined.
Entirely new faction, The Taken, being introduced into the game. Past enemies ripped out of existence then thrown back in with new abilities and behaviors.
Entirely new weapon class (Heavy slot).
Level system back to the classic MMO exp leveling, from 1-40.
All current character max levels in Destiny will be the starting level come TTK.
One consumable buff per account to buff a single character to minimum required level for TTK.
Multiple new locations, with one being a new patrol area.
Patrols are now not easy mode, but rather the Dreadnaught contains secrets and treasures to keep players coming back to Patrol each week.
Weapons (legendary and exotic) have questlines to obtain them.
Eris Morn and Cayde 6 play major roles with the first story line of TTK.
Gunsmith now plays a major part in replayability including a reputation meter, weapon quests and weapon testings.
8 new Crucible maps in new locations and new map mechanics.
1 new subclass for each character class (3 total), covering the missing element from each respective class.
Nolan North taking over as head character voice for Ghost, retaking every line in the game and adding more to the existing game and TTK.
Over a dozen new exotic weapons and many more exotic armours for each class.
New Raid (King's Fall) being the biggest and best raid yet (Luke Smith - GameInformer).
Current mechanics for Destiny are/have been balanced and will be revealed at the launch of TTK.
New solution for the Vault system in works for release of TTK.
Armours have new mechanics which have more meaning based on your light level (which isn't being scrapped, it's just not the leveling system).
All weapon classes are being re-tuned to fit the new meta Bungie wants to have for Destiny.
Entirely new soundtrack equal in size to the current one.
Oryx makes his first appearance.
New ways of discovering lore within the world via the Ghost.
Emotes are now equipable.
Ghost shells offer character bonuses, class items offer character bonuses.
New cinematic cutscenes, all cutscenes have skipping enabled.
Entire Director menu being redesigned, Vanguard Strikes have revamped playlists.
Negatives;
The massive price differentials between countries outside of USA.
Only 1 new patrol region, being the Dreadnaught, even with Phobos being the first mission of TTK it will not be a region operating for Patrol.
A quarter of the new Strikes with TTK being locked to PSN.
2 recycled grenades per new subclass from already existing subclasses.
Nightstalker needing serious nerfing before TTK is released, currently as it stands holds potential as the most powerful subclass in the game by a landslide.
Digital and physical editions of the Collectors being the same price, even though digital Collectors contains less overall content.
"That Wizard came from the moon" dialogue line still not making an appearance in the game, with Nolan North being the VA for Ghost.