Two listings for Metal Gear Solid 5 Definitive Edition on Xbox One and PS4 have been spotted—one on Amazon Canada, and the on Dell, of all places.
Twitter users lifelower and Wario64 were among the first to spot the leaks and provide photographic proof of their existence. Both Amazon's and Dell's listings are still live as of this writing, amid the standard releases of Metal Gear Solid 5: The Phantom Pain that launched on Xbox One and PS4 last year.
There are two omissions of note from both outlets. First and easily explained is a lack of contents for Metal Gear Sold 5 Definitive Edition. You'd be excused for wondering what your $60 gets you (the game's assortment of DLC and updates seem obvious additions) but neither Dell nor Amazon goes into details. That makes sense, though. Neither listing shows box art, implying that it's too early to get caught up in details that can be filled in later.
The second is that neither outlet includes PC as a platform that will receive Metal Gear Solid 5 Definitive Edition. That doesn't mean it won't happen (Konami hasn't confirmed or denied Definitive Edition's existence yet) but the base game did launch on PC alongside the console versions, so it's not unreasonable to wonder if that platform will be privy to the package deal.