We don't have the exact date or the exact month either but sources close to company confirmed that new OS X codenamed Leopard comes out this spring.
Well the spring just arrived some week ago and we probably have a long way to go before we see Leopard in action.
One thing is certain it will leave Vista in dust as even Tiger looks and feels better than Vista. This is good news for all of your Mac lovers. Despite some delays it looks like the new Leopard is closer than anyone things.