Konami, keeping with its pursuit of the lucrative pachinko market in Japan, revealed the existence of a Metal Gear Solid 3: Snake Eater pachinko machine. The trailer for the device spans over seven minutes and goes into great detail regarding the mechanics and gampelay pachinko players can expect to see. However, the most intriguing parts of the reveal are the cutscenes. The scenes shown in the trailer appear to be from Metal Gear Solid 3 remade in the Fox Engine on which Metal Gear Solid 5 ran.
The trailer claims that the upcoming pachinko machine houses over 124Gb of data for its gameplay and cutscenes. This would be a huge amount of time and investment for pachinko, but might make more sense as a harbinger of a full-on remake in the engine Konami has barely put to use. The cutscenes themselves seem fairly consistent with the original PlayStation 2 title, though there are a few that appear to be created specifically for pachinko mini-games.
Keep in mind, this is all speculation. Looking at Konami's recent moves as a company, I think there is reason to believe a remake of Snake Eater is imminent. Konami has been showing a desire to get more out of its properties while avoiding the bloat of costs that can be associated with AAA development. They also haven't remade Metal Gear Solid 3 yet, which seems remarkable given that the entire industry is remaking pretty much everything. With Hideo Kojima gone, Konami could very well be reluctant to put out more original Metal Gear titles. Konami's impressive Fox Engine has been gathering dust, too. All of these signs point toward a willingness to move forward with a remake of Metal Gear Solid 3 for modern consoles and the pachinko machine's assets confirm that to me.
There is no official word on whether Metal Gear Solid 3: Snake Eater is being remade, but I'd be willing to bet it is in development.