The PTPA was formed by Novak Djokovic and Vasek Pospisil a few years ago and they teased some big news to be revealed in the coming days.
The PTPA was formed in 2019 to represent the players' best interests, arguing that the current organization led by the ATP, WTA, and ITF has some deficiencies in dealing with athlete matters. It didn't find widespread approval although individual players came out in support of it (Raonic, Isner, Opelka, Schwartzman).
The social media channel of the organisation teased some big news coming this week: "Big news coming this week... Players, keep an eye out for event info - we’ll see you in Melbourne!"