In a move that seems to be one mainly out of greed like 95% of the other cases where Apple has been sued, a Chinese developer is claiming that the Siri voice assistant infringes on a patent that had been filed in 2004. Perhaps it may be fine for the Shanghai developer to believe that Siri takes after its ambiguous patent, however the developer crosses a line of their own by releasing an update to the product that they claim Siri copied, with the company effectively copying the look and feel of Apple's Siri implementation.
It's fairly clear from Apple's more recent decisions that they've been loosening up their policy on private API calls. An Apple forum moderator outlined the changes in the developer forums, stating outright that certain API calls that were previously restricted are now fair game. Among them is an API from Apple's Core Graphics framework that makes things like capturing screenshots and streaming video from the camera possible.