A rather lengthy post but some good info about why Destiny has changed so much from announcement to release. Sounds like Bungie had a vision and Activision was like, "lol vision? MOAR DLC!" That would be my guest. Could simply be the game was too ambitious and wasn't close to finish so the suits pulled the unfinished stuff to make the release date. Either way, Activision/Bungie has already made a ton of money with more coming from DLC.
How Destiny's Content COMPLETELY changed over the last year (TONS of info inside) : DestinyTheGame
How Destiny's Content COMPLETELY changed over the last year (TONS of info inside) : DestinyTheGame