https://www.polygon.com/2018/6/27/17511498/destiny-2-data-mining-armsweek-exotic-catalyst

Destiny 2 got a minor patch yesterday to fix an Eververse issue from last week. But this update also contained some new, interesting details about eight upcoming exotic catalysts. It also seems to confirm the return of Armsday as a new event called Armsweek, something that’s been rumored and leaked before.

On the Destiny subreddit, user Eander posted a listing of new data taken from the Destiny API. The list was posted to Light.gg — an API tracker for Destiny — and copied into the Reddit post. According to the API, these catalysts look to be coming in the Solstice of Heroes patch for Destiny 2, which is set to be released July 17, about a month and a half before the launch of Destiny 2: Forsaken.