Toyota has always been an arms length away when it comes to F1. When it comes to anything major be it in terms of regulations, rulebooks, upcoming deadlines and plans for F1, you can bet that Toyota has been listening in. Toyota is way too big to ignore.
Despite them being away from F1 for 14 and a half seasons (2010 to part-way through 2024, their partnership with Haas will start immediately and you'll see TGR logos all over the VF-24 for the US GP), Toyota facilities have been used by numerous F1 teams to this very day, most notably McLaren, until they started using their own wind tunnel that they've been building for the past couple of years.
Toyota has stressed that this isn't a works team effort, but using basic logic, if things do go well, I wouldn't be surprised if it becomes a pseudo-works effort by the end of this decade or the beginning of the next.
So there we have it, Toyota is back in Formula One.
When I first posted here it was in the Lexus Racing Megathread in 2018, possibly dreaming about a Lexus F1 team, and lamenting the loss of the Toyota F1 team due to their own shortsightedness, but now we're back.