Looks like we're getting a fifth announcement from Platinum Games at some point.
Platinum Games has updated its Platinum 4 teaser site again with a fifth reveal set at some point in the future.
The developer is calling this a "bonus stage" after the fourth announcement on Wednesday, April 1 turned out to be an April Fools' joke.
— PlatinumGames Inc. (@platinumgames) April 3, 2020
In actuality, this will be the fourth reveal, considering.
Who knows what the bonus stage announcement will be, but hopefully it isn't a joke this time.