Joe Rossignol, MacRumors:
Apple has since updated its website following the end of WWDC, however, revealing that the new Mac Pro and Pro Display XDR are “coming in September.” This date is listed on Apple’s homepage in an overlay that pops open after clicking on “notify me” under each product, although only in the United States.
Update: Apple’s homepage now says the new Mac Pro and Pro Display XDR are “coming this fall.” It’s unclear if the “September” timeframe was simply a mistake or prematurely-revealed information. We’ve yet to hear back from Apple.
In the keynote and the relevant press release, Apple only promised a “fall” availability which, as John Siracusa pointed out, technically gives them until December 20 to meet the self-imposed deadline.
Also, Apple’s non-American websites still show the old Mac Pro model’s marketing pages.