Destiny's next major expansion appears to be The Taken King, according to what looks like specially branded boxes of Red Bull energy soda bearing the name and a logo associated with it.
Bungie, Destiny's developer, filed for a trademark for "The Taken King" in late April, and the application included a logo similar to the one seen on the packaging in this picture taken by Twitter user AgriosEndendros.
The URL mentioned is a dead end right now.
Destiny publisher Activision announced in February that Bungie is working on a "major content release" for the game that the studio is planning to release this fall. Bungie's original contract with Activision from 2010 stipulated that the studio would put out a downloadable expansion, codenamed "Comet," in the years between major entries in the Destiny franchise.