In my previous news post, I already mentioned that Spore will be released worldwide in September 2008. To confirm this even more, you can view the teaser here on the official website.
I received multiple news letters and press releases with the release date from Spore. Here's the press release in English.
"The wait is almost over," said Maxis Chief Designer Will Wright. "We're in our final stages of testing and polish with Spore, and the team at Maxis can't wait to see the cosmos of content created by the community later this year."
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I wasn't able to announce the release date on February 12, due to circumstances. But the most important thing is that it has been announced through press releases and news letters from the official Spore website.
Spore will be released worldwide on September 7, 2008. In Europe we're lucky, it's September 5 for us Europeans! And people from The Netherlands are really lucky, because they will have the game on September 4 (which is a Thursday, and in The Netherlands, Sims expansions are always released on Thursdays).