Yep you read right, there's a Control Hideo Kojima Easter egg in the game! Control features a brief voice cameo of Hideo Kojima along with Kojima's Production Manager, Aki Saito.
Back in March of this year, Kojima personal assistant, Tweeted our a photo of Kojima doing some voice work, though as to what exactly it was for was unknown at the time with the only hint being that it was VO work for "the other Sam"
For those who don't know, Sam is both the name of the main character in Death Stranding, and also that of Remedy's Control creative director(Sam Lake) . Many speculated it may have been tied to Splinter Cell as well since the main protagonist is named Sam Fisher. Ubisoft recently payed homage to the Metal Gear Franchise with a touching Easter egg as part of a Splinter Cell DLC for Ghost Recon Wildlands, which you can watch below.
However, since the release of Control it has now been confirmed that Kojima does indeed feature some Japanese voice lines along with Aki Saito, Manager over at Kojima Productions providing translation.