A lot of content has been teased regarding this collaboration. These teasers include four remixes of previous soundtracks, one boss character (Huggy Wuggy), one playable character (Kissy Missy), and a map called "Playtime Co. Factory". More content may come out in the future regarding this as more updates are teased. Later, it was announced in the lead developer's Q&A streams that Cat-Bee, The Player, and Boxy Boo would be featured as a trap, mortal, and monster respectively.
Huggy Wuggy is the main antagonist from the hit-indie horror game "Poppy Playtime" first chapter, and a boss character for Glowstick Entertainment's "Dark Deception: Monsters & Mortals"
Behavior
Currently, Huggy Wuggy has only been teased to be a boss character presumably for the Playtime Co. Factory map. There is no known info on how Huggy Wuggy may act, although he may chase you throughout the vents
Trivia
Huggy Wuggy was teased alongside with the Yandere Simulator collaboration via twitter.
Overview
Kissy Missy is a recurring character first introduced in the hit-indie horror game "Poppy Playtime" first chapter, and a playable character for Glowstick Entertainment's "Dark Deception: Monsters & Mortals"
Behavior
Kissy Missy will be a playable character, basically meaning you can choose to play as her alongside many other characters, content creators, etc. It is unknown how Kissy Missy will operate as a playable character as she is presumed the same size as Huggy Wuggy (17 feet).
Trivia
In the collaboration, Kissy Missy has the same sharp teeth as Huggy Wuggy and is in the 'monster' team, while in the original she's friendly and doesn't have teeth.
Due to this being an official crossover, it's likely Kissy Missy canonically has the same teeth as Huggy, but doesn't show them due to being friendly
The collaboration with Mob Entertainment first was announced on Twitter along with the CoryxKenshin collaboration[1], and the Yandere Simulator teasers.
It was later teased that the Poppy Playtime DLC will release after the Yandere Simulator DLC.