Manifold agrees that it is indeed "very, very big", "as big as it gets", "one of the most important announcements that have been made in many years about a certain subject" etc.

I'm currently thinking perhaps a weak yes/no should add 0.5 points for that side and a strong yes/no should add 1 whole point.

https://www.nytimes.com/2025/05/06/us/politics/trump-very-big-announcement.html

President Trump repeatedly talked up a future announcement, “one of the most important announcements that have been made in many years about a certain subject,” during an Oval Office meeting on Tuesday with Prime Minister Mark Carney of Canada.

He never said what he could be talking about, or what “very important” subject he is referring to, only suggesting it would be made before he leaves for a trip to the Middle East next week. But even the timing of the big announcement wandered, with Mr. Trump saying it “will be made either Thursday or Friday or Monday.”

“We will have a very, very big announcement to make. Like as big as it gets. And I won’t tell you on what,” Mr. Trump said, before adding “it is really, really positive.”