It seems as though Yahoo! intends to separate its own site from Inktomi in some form. On the PositionTech website the following warning exists.

"IMPORTANT NOTICE ABOUT INKTOMI SEARCH SUBMIT:
Yahoo! Search has transitioned to its own search technology and is preparing to launch a new inclusion program. As a bonus for Search Submit customers, Yahoo! Search is providing a free trial of Yahoo! traffic that will end on April 15, 2004. When the new inclusion program launches, Search Submit customers will have the option of joining the new program for ongoing participation in Yahoo! Search results."

Two Yahoo! Search Indexes:
Some people have been questioning if Yahoo! Slurp is creating an entirely new index. Certainly the upcomming Yahoo! Search paid product would lead one to believe they are trying to create multiple different search indexes.

More info on the new Yahoo! Search:
They answer many questions about Yahoo! Slurp on their Yahoo! Slurp FAQ page.

Yahoo! Slurp indexes the first 500k of any web page, which is a significant improvement from the 100k Google indexes. They also have improved the relevance of the Yahoo! Search index by using existing spam filters which processing millions of emails each day. Today Search Engine Watch did an in depth review of the new Yahoo! Search product.