The Information is reporting that Siri will be expanded with better 3rd party integration to make using the iWatch easier. Logical conclusions are fun, eh? The reasoning is simple: screen real estate is extremely limited on smartwatches, so you need another reliable way to interact with the device, and that's where all of the work on voice command systems comes to fruition. The report does go a bit beyond our assumptions to describe the potential usage a bit, saying:That's right!
This quote makes it sound like Siri won't just get better 3rd party app integration, but will also move away from voice command a bit and begin working based on context, more like Google Now. It would make perfect sense that the iWatch would serve you a certain app based on context, but given that Siri has been voice interaction-only so far, we assume that the quote simply means that Siri would notify you verbally that the app has started rather than the apps being more deeply integrated into Siri like cards are in Google Now.
Still, the future seems clear: wearables will rely heavily on voice command systems, so we should be seeing a lot of work done on Siri, Google Now, Cortana, and S Voice as we move forward in 2014.