Early last week, Playtonic Games announced that the 64-Bit Mode Tonic has finally been added to Yooka-Laylee and is currently only available for use on the Nintendo Switch & PC. They stated that it will be available for PS4 & Xbox One at a later time due to some bugs that need to be ironed out.
Here are a few screenshots showcasing the 64-Bit Mode.
Also here’s a trailer showing off the 64-Bit mode as well.
Source: Playtonic Games