rebelde - 4:19 pm on Nov 6, 2009 (gmt 0)
Google has incorporated a language detection parameter to the algo. I can't say as to whether it is a *new* feature, or if it only in the past 3-4 weeks has been given greater value.
I have thousands of multilingual pages. If Google even slightly altered its algorithm for languages, I think I would know it. I have seen no change recently.