Yes, you heard right, don't get Destiny right now, wait until [b]The Taken King[/b] comes out, because you'll be getting not only the game itself and [b]The Taken King[/b], but [b]The Dank Below[/b] and [b]House of Wolves[/b] as well for a grand-spanking $60 (U.S.).
So unless you feel the absolute need to, refrain from buying Destiny until TTK comes out, because then it'll be worth.
If you can snag a copy by license transferring with a mate or friend, then do so at your own risk.