They never said they will not, they said Spanish and other languages are coming this year, Siri has just been pulled out, there's a lot of stuff yet to come.
I'll quote Apple: "In 2012, Siri will support additional languages, including Japanese, Chinese, Korean, Italian, and Spanish."
http://www.apple.com/iphone/features/siri-faq.html
Technically, Siri is still in Beta. Seems odd with the worldwide release and all the attention but it's not a finished product. I'm sure the other languages are part of that.
It's amazing how much the jailbreak community has already added to siri that apple could not or has yet to.