Learn German: Jemand plaudert wohl gleich die Überraschung aus. - Someone is probably letting the surprise slip right away.

Here, wohl acts as a modal particle to express an assumption or high probability. It adds the flavor of "I assume," "I suppose," or "probably" to the sentence. While you could use the adverb wahrscheinlich (probably), using wohl sounds more conversational and natural for expressing a strong hunch.

What verb is being used here, and how does it differ from just plaudern?

The verb is ausplaudern, which is a separable verb meaning "to blab," "to spill the beans," or "to let a secret slip." While plaudern on its own just means "to chat" or "to converse," adding the prefix aus- changes the meaning entirely to revealing information that shouldn't be shared. Notice how the prefix aus moves to the very end of the sentence.

The sentence is in the present tense, but the English translation feels like the near future. How does that work?

In German, you often use the present tense combined with a time word to talk about the future, rather than using the future tense with werden. Here, the time word gleich (shortly, in a moment, right away) signals that the action is about to happen. Together with wohl, it translates smoothly to an assumption about the immediate future without needing Futur I.

Why are wohl and gleich placed before die Überraschung?