Destiny 2 was originally rumoured to launch back in 2016 but was ultimately delayed by a year with Bungie having to scramble together to find content that would tide players of the original over.
It's no secret that Destiny suffered from content droughts. Being extremely similar to a standard MMO, there's always players capable of exhausting high-level content more quickly than the developers can churn out - often creating months of nothingness for players with more time on their hands than others.
For Destiny 2, however, Activision are committed to dodging what plagued the original by enlisting the help of more studios than just Bungie; like Viscarious Visions and High Moon - of Crash Bandicoot N. Sane Trilogy and Deadpool fame, respectively. Activision's CEO Eric Hirshberg acknowledged to GamesIndustry that there "was appetite for more" content that what was ultimately delivered.
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And this shouldn't come as much of a surprise. It's been documented many times before that other studios would be drafted in to work on specific segments of a game while the main studio toils away on the story mode or multiplayer aspects. In the case of this particular parnetship, High Moon helped develop content packs for Call of Duty: Advanced Warfare while Vicarious Visions have played a hand in porting dozens of games to low-priority consoles since the 90s.
Both teams will be put to work on helping Bungie fill Destiny 2 with as much post-release content as possible. Meaning we should be seeing more than just one update every 6 months or so.