Supposedly, Google and HP were in talks over the past year, but those talks have fallen through. The plan would be for Google to add enterprise-specific voice commands which would allow employees to easily find company info, like financial data or inventory data. Google might have been the one to cause the talks to break down, because Google was reported to be "noncommittal" on the deal, although it is unclear why that might be.
According to the rumor, back when Andy Rubin was still in charge of Android, HP approached Google about potentially building a Nexus device designed for enterprise use. Rubin was reportedly uninterested in the idea, although it may have been a good idea. HP wanted to add advanced features, like high-end hardware encryption, which sounds like it is outside of the stock Android vision of the Nexus program. But, it could have been good for the Android ecosystem as a whole if Google had embraced the idea of creating an enterprise reference device to go along with the consumer reference Nexus devices.
It is certainly possible that the Google Now options are still in the works, and Google could partner with another company, so we'll have to keep an eye on this.