Apple should not hurry with new OSX. Why ? Because Apple consumers and experts still waiting for something really spectacular and well-rounded.
In my opinion and also some Apple experts Snow Leopard was similar mistake product like Microsoft Vista was.
Maybe it is also a time to start talking about new universal file system (what about ZFS ???), full Intel UEFI compatibility (what about users who want to run Windows 7 64-bit on Macs ???) and full GPU support under OSX. I am really bored this battle between Apple and Adobe regarding Flash. What about USB 3.0 support under OSX ? What about future - Intel Light Peak support ? What about native NTFS write under OSX without buggy drivers from external companies ? Maybe it is time to propose a real native file manager ? Questions, question, questions...