Some analysts say no. Then again they've been wrong before.
http://www.macobserver.com/article/2006/07/07.7.shtmlThis was interesting , if true:
QUOTE
Apple vice-president of worldwide marketing Phil Schiller told him that the company would "absolutely not" include virtualization similar to Parallels in the next version of Mac OS X. "The R&D would be prohibitive and we're not going to do it. Our solution is dual boot," Mr. Schiller told the analyst.
Maybe not in Leopard but maybe Lynx? Or Cougar?
Or maybe they'll just buy Parallels and incorporate it.