Developer Playtonic Games appears to be teasing the announcement of a new game via their Twitter account.
A tweet posted today contains a video featuring tweets from fans asking when they'll announce their next project after the throwback hit from the ex-Rare developers Yooka-Laylee. Notably, each of these tweets specifically mentions a 'new game' so it seems a good bet this will be an entirely new title and not just additional content for their 2017 Kickstarted platform adventure such as the 64-bit tonic added just a few months ago.
The video is also captioned 'bee back tomorrow' for more information - Yooka-Laylee's main antagonist was Capital B and himself a giant bee, so perhaps a sequel is on the cards? We'll find out tomorrow.