Mac OS X Snow Leopard on Apple.com

Apple has published Mac OS X Snow Leopard on its website.

There’s no mention of the version of Mac OS X Snow Leopard yet. It might not be version 10.4.6 as of now yet.

Mac OS X Snow Leopard features:

• Microsoft Exchange Support
  Snow Leopard includes out-of-the-box support for Microsoft Exchange 2007 built into Mail, Address Book, and iCal.
• Multicore
  “Grand Central,” a new set of technologies built into Snow Leopard, brings unrivaled support for multicore systems to Mac OS X.
• 64-bit
  To accommodate the enormous amounts of memory being added to advanced hardware, Snow Leopard extends the 64-bit technology in Mac OS X to support breakthrough amounts of RAM — up to a theoretical 16TB, or 500 times more than what is possible today
• Media and Internet
  Using media technology pioneered in OS X iPhone, Snow Leopard introduces QuickTime X, a streamlined, next-generation platform that advances modern media and Internet standards.
• OpenCL
  Another powerful Snow Leopard technology, OpenCL (Open Compute Library), makes it possible for developers to efficiently tap the vast gigaflops of computing power currently locked up in the graphics processing unit (GPU).

http://www.apple.com/macosx/snowleopard/