Let's take a look at TTK content: -lots of new missions, 3 new strikes (4 for PS) and 3 new revamped strikes -12+ exotic weapons and 6+ armours for each class -a new explore able area -a huge new raid -more cutscenes -more characters involved in the story (vanguard mentors for example) -the biggest raid -a new public event -a new enemy race -a new villain -3 new subclasses -3 new crucible modes -8 new crucible maps -new weapon foundries with signature types -no more light determining level, now XP -new scanning feature to tell you about your surroundings -now tells you who's talking in the top right corner -Light now determines your strength -Different quest lines (I.e 'Still Got Wolf Problems) -Strike and mission-specific rewards -Loot themed around certain activities (the skull-helmet from one of the trailers) And probably more. That DEFINETLY worth $40 for a DLC.