So at last Macintosh is presented to WWDC and hackers should fasten their seat belts for some fun.

TUAW claims:

Trusted sources tell TUAW that OS X 10.7 Lion has gone live for internal Apple testing as recently as last week. An internal testing release generally indicates that Lion is near to a real world debut.

So we should hope at the end of day that the key note should publish the Lion to developers giving the dates to the consumers.