It's been three years since Metal Gear Solid V: The Phantom Pain launched and almost just as long since Konami said that they wouldn't focus much on games any more, so it's kind of surprising that we just got the first significant MGS V update in almost a year.
The update isn't a tiny bug fixer either, as one of the most noteworthy things about it is that it allows us to play as Quiet in FOB missions. Obviously, we won't get to change how she looks and what she wears, but who needs that when she becomes nearly invisible after remaining still for a short amount of time? Her sniper skills also come in handy, as the scope barely shakes when aiming. Top this with a dash that would make the Road Runner think twice before challenging her and unique jumping abilities that allow her to jump to places other characters would need ladders to reach.
That's not all that is included in the update either. We also get new Online Development items, including a few sniper rifles and dark matter generators, a more challenging difficulty level for Event FOB mission fittingly called "Event FOBs [HARD]", there's no longer a risk for someone taking revenge after these events, and a few minor bug fixes that Konami hasn't given us detailed information about.
Time will tell if this is something Konami is doing because they have plans for Metal Gear in the future, or if they just realised that people are still playing Kojima's last Metal Gear game.