Surprisingly, users of the tweaked OS, report that it runes faster on Intel machines. The common assumption is that it is a developers’ version that leaked to the web.
Unsurprisingly , the story works well for apple who switched lately to Intel processors.
Apple is known to enforce an extremely strict secrecy before a product is released; therefore such a major “leak” is suspicious. Time will tell if it is a major breach in security at Apple or another one of Jobs's PR stunts.