Destiny 2 improves upon its predecessor in many ways. In short, it offers a more satisfying, shared-world experience. Building upon that, the game's developer Bungie is today launching the Guided Games beta. The feature essentially delivers the matchmaking system for high-level activities that the first title lacked. Players may have noticed the longer-than-usual server maintenance downtime today, which brought with it a a massive patch. Download it and you'll get Guided Games.
Source: Bungie (Twitter)