Not only is July 15 the date for the U.S. government's interim report to Congress on the "surge," but it also likely to be the date for a no-confidence vote in Maliki's government, according to CBS:

CBS News has learned that on July 15, they plan to ask for a no-confidence vote in the Iraqi parliament as the first step to bringing down the government of Prime Minister Nouri al-Maliki. ...

Iraq's prime minister is facing his most serious challenge yet. The no-confidence vote will be requested by the largest block of Sunni politicians, who are part of a broad political alliance called the Iraq Project. What they want is a new government run by ministers who are appointed for their expertise, not their party loyalty.

Strangely, the CBS report says that the idea was "discussed in detail on Vice President Dick Cheney's most recent visit to Baghdad, when he met with the Iraqi Vice President Tariq al-Hashimi." That raises more questions than it answers. Was Cheney opposed, or in favor of, the effort to bring down Maliki? I find it hard to believe that Cheney would support the idea, but it needs some more reporting.