It makes sense that Retro, which has been quiet since the release of Donkey Kong Country: Tropical Freeze on Wii U, would have something in the works that's ready to be shown at E3.
Reported on Eurogamer, a new round of rumors from Reddit and image boards suggests that Retro Studios has been working on a project titled "Star Fox: Grand Prix", a sci-fi racing game said to feature elements of Nintendo's own F-Zero with an action game twist.
Star Fox Grand Prix will apparently feature boss fights, a hub world to explore, and an adventure mode.
More details were revealed through Reddit user DasVergeben, a user who provided leaks previously about games such as Soul Calibur VI, that compared Retro's Star Fox project as a racing game "like Diddy Kong Racing mixed with F-Zero". At this point, I'd say "The first major F-Zero game in 15 years!" has more cachet than a Star Fox racer.
Diddy Kong Racing, developed by Rare and released for the Nintendo 64 in 1997, was a fantastic title that is often glossed over in Nintendo history. However that project has most likely been canned due to development difficulties.
The whole concept sounds strangely similar to The Curse of Pigma, one of several endings to Star Fox Command. A Star Fox racing spin-off. An F-Zero game from Retro is something I can get behind. However, it's useful to note that Mario + Rabbids Kingdom Battle was widely chastised when it leaked prior to its proper E3 unveiling.
We don't know whether Retro has been working on Star Fox Grand Prix for the majority of the past four years or not.
Keep your eyes on the Mammoth Gamers for further developments on the next probable Star Fox game. And if that's the case, Nintendo is nearly certain to pulled the curtain back on the project at E3 next month.