More details from Mark Gurman about the upcoming Siri redesign:

Apple has redesigned Siri for modern iPhone hardware, making it live inside the Dynamic Island as an always-on agent that can help users get things done across the operating system and within apps. […] Apple plans to let users swipe down from the top center of the iPhone anywhere in the system to launch a new Search or Ask interface.

So close to WWDC, I assume these leaks are accurate.