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The other change is much more important since it points to Google making use of certain semantic web technologies. Related searches - the terms associated to your query which are sometimes displayed at the bottom of the search result page - are now more intelligently chosen through the use of a new technology (Google hasn't given out any details about the technology in question).
The example that Google gives is the search query "principles of physics." The related searches offer will include terms such as "special relativity," "angular momentum," "big bang" and "quantum mechanics." It's not for English users only; as Google explains, it'll work in 37 languages all around the world.