Pack Dynamics 4 has now been enabled for all of Zwift. You can read more of the detail in this post: Pack Dynamics 4 Release [April 2023]
Because this is a server-side release, it means that all Zwifters will receive benefit from PD4 the next time they log in, regardless of whether or not they’re on game version 1.34 or not.
We included the Pack Dynamics 4 details in this release note as we were targeting this week with rollout initially, and it seemed the best place to put the note.
Enjoy! 