"[These changes] deliver a dynamic, compelling, and integrated experience that better understands what you are looking for so you can get things done quickly on the Web."To us it means better integration of user query formation tools, better use of structured data on the Web (e.g. RDF data, metadata, etc.) to provide improved results and results browsing, and improved filtering tools, something which is nicely explained in their grand tour. According to their blog though, better integration of these innovations involved a serious overhaul of the Yahoo! Search technical architecture to make it run faster.