Apple has announced that the Q3 earnings call (April - June, 2012) will be held on July 24. This is important for two reasons: first, the world will get to hear how well the company did over the past three months and second, last year Apple released Lion the day after the Q3 earnings call.
While the company can pretty well call the shots on when it releases the next version of Mac OS X, if Apple follows last year's lead, we might see Mountain Lion in general release on July 25. This, of course, meets the "end of July" deadline for the release of the latest cat.
As always, TUAW will hold a metaliveblog during the event for commentary and analysis.