On his blog Adrian Tchaikovsky has confirmed that the seventh volume of his Shadows of the Apt series will not make its August publication date. Though the novel was handed in a few months ago, the turn-around proved a little tight. The novel will instead be published on 7 October 2011. Since that means that Tchaikovsky still gets two large fantasy novels out in the same year (Book 6, The Sea Watch, only came out a couple of months ago), that's hardly a disaster.
Tchaikovsky is now hard at work on the eighth volume, provisionally titled The Air War, for publication in 2012.