Item: A playtime reference that may suggest Poppy Playtime Ch. 3
These details from Project: Playtime may provide some valuable clues about the next chapter, such as character appearances and a possible release date.

Project: Playtime, the multiplayer spin-off of Poppy Playtime, doesn't seem to necessarily further the overall lore of the series--but some hidden details suggest otherwise. The recently released asymmetrical horror game, despite its troubled launch and various bugs, has already attracted plenty of fans for its unique, liminal atmosphere and dark story. Some particularly dedicated fans took the time to examine every detail of these maps, speculating that these details might actually hold clues about the next major game in the series.
In Project: Playtime, the survivors act as "resource extraction specialists", who are sent to an abandoned Playtime Company factory to recover certain assets for the company. Meanwhile, Hitman takes on the role of three iconic beasts from the world of Poppy Playtime: Huggy Wuggy, Mommy Long Legs, and the new Boxy Boo - each with unique abilities to fulfill their role in Project: Playtime. Both the survivor and the killer may be preoccupied with more pressing tasks during the game (building giant toys and killing humans, respectively), but if they take a moment to look around the map, they will find that Some clues for Chapter 3 of Poppy Playtime.
Daddy Long Legs May Be In Poppy Playtime Chapter 3

With Boxy Boo being introduced to fans through an extensive ARG, and finally released in-game in Project: Playtime, many suspected that he would be the main antagonist in the next chapter. While it's hard to deny the possibility, an interesting detail spotted on YouTube by the Huggy Wuggy and Poppy Playtime Show suggests that different monsters will also be involved in Poppy Playtime Chapter 3's dark story. The poster, where maps can be found at the factory, depicts Daddy Long Legs grilling meat — but more suspiciously, he invites readers to join him, giving dates, addresses, and even RSVP phone numbers.
It is unclear what the address or phone number is, but July 15th may imply Poppy Playtime Ch. 3 release date. If that's the case, then there's a good chance Daddy-Long-Legs will be involved in the story, at least as a supporting character. This could prove to be very interesting knowing his relationship with Mama Long Legs, and it could serve as a continuation of her lore from Chapter 2.
The Prototype Might Make A Reappearance In Poppy Playtime Chapter 3

prototype is Poppy Playtime's most enigmatic character, he has remained elusive in lore so far. However, this detail, captured by Sheeprampage on YouTube in Project: Playtime, may hint at his reappearance in Poppy Playtime Chapter 3. This loading screen appears very rarely, and it clearly depicts the prototype's creepy mechanical claws controlling Mommy Dragon's legs as if she were a puppet. While this makes for some intriguing original artwork, it also hints at the fact that this highly intelligent individual might actually be behind all of Poppy Playtime's events. This makes it especially likely that players will see him return in Chapter 3.
A release date for Poppy Playtime Chapter 3 (which is supposed to end the series) has yet to be confirmed, but with rumors that it will be released sometime in 2023, it won't be long before fans reveal the truth for themselves. If the poster theory is correct, it could arrive as early as July 15th, possibly with Daddy Long Legs as the main antagonist. Likewise, the archetype might also come back into the story as the mastermind behind everything. Either way, fans have items ahead of the release of Poppy Playtime Chapter 3: Playtime to keep them company - and more hints may be found within.
More: Project: Playtime - A Survivor's Guide (Tips, Tricks & Strategies)