He said unexpected so I'm guessing Death Stranding as a whole was a troll game and it was actually hinting at Knack 3 which will launch on November 8. They then upload a 40 minutes video of Kojima explaining all the little details that were hinting at this. BUT THEN, once you finish Knack 3 it's actually revealed that he never left Konami, has actually been working on MGS VI all this time and Knack 3 (and by extension Knack 1 and 2) have all been a teaser. In the same announcement it's also said that people who get the platinum in Knack 3 should "keep their eyes open", which is quickly discovered to be related to a weird blinking the Dualshock 4 LED makes when getting the platinum for the game, which is then found out to be morse code that translated into certain directions. Through some further hints by Kojima people realize this is connected to P.T (which, nevertheless, is not made available again as to reward the most loyal fans), by walking in these specified directions you hear the "alert" sound from Metal Gear which is then followed by the door opening and Knack standing there in full Solid Snake costume, at which point he speaks with the combined voice of David Hayter and Kiefer Sutherland (like fusions in Dragon Ball, because yeah Toriyama is involved too) and says "kept you waiting, huh?". The same original PT Norman Reedus trailer then starts playing but it now has additional scenes because it's finally revealed that it was always MGSVI.
Norman appears the same way he did in the original trailer but now he carries one of those DS babies which he drops, shattering the glass it is in. We think it will die but instead it starts to grow until it turns into none other than Tommy Lee Jones who we now learn will play "angry old Snake". Right as we think this odyssey is finally over, we get one final scene with a man showing his back to the camera, we hear Snake saying "Otacon?" and then we see this man turning around revealing the face of.... Kevin Spacey?. But wait, wouldn't it be bad press to have Kevin Spacey in this?, except it's then revealed the whole scandal was orchestrated by Kojima and never actually happened. What we had all missed is that is that if you took the time to figure out the social security number of the Ex wife of Spacey's Lawyer, and then turned those numbers into letters you'd get ..... "LaLiLuLeLo"
Or you know, could be that Bluepoint game.