In the teaser trailer titled "Last Call", Cayde-6 (portrayed by none other than Nathan Fillion) recounts the events that transpired leading to the fall of the Vanguard's Hall of Guardians while presumably taking some "creative liberties" on his heroic performance whilst defending himself as well as his comrades Ikora Rey and Commander Zavala.
In the featured trailer, he makes an attempt at rallying the various Guardians spread throughout the ruins of what was once the Tower or the last city on Earth. Comically however, his motivational speech is not nearly as impressive as Commander Zavala's but with the promise of "loot", the Guardians in his midst are rearing to take on the Cabal who had the "Ghaul" to invade and destroy the Vaults containing the Guardians' arsenals (pun intended).
The official description of the reveal trailer reads as follows:
In addition, knowing that Bungie had DLC expansions, I can at least somewhat predict that the same pattern will occur once again. As such, I suspect that Season Pass will be offered. Let's recap on when the original game released its downloadable content:
1.) The Dark Below released on December 9, 2014
(91 days from the time of the launch of Destiny or approximately 3 months).
2.) House of Wolves released on May 19, 2015
(252 days from the date of the launch of Destiny or 8 months, 10 days).
3.) The Taken King released on September 15, 2015
(371 days from the date of the launch of Destiny or 1 year, 6 days).
(119 days from the date of the release of the House of Wolves Expansion or 3 months, 27 days).
4.) The Rise of Iron released on September 20, 2016
(371 days from the date of the release of The Taken King Expansion or 1 year, 5 days)