Just saw this at the Verge....
http://www.theverge.com/2016/5/25/11765624/walt-mossberg-apple-wwdc-2016-siri-ai-bots
http://www.theverge.com/2016/5/25/11765624/walt-mossberg-apple-wwdc-2016-siri-ai-bots
I'll be looking for Apple to show a greatly expanded Siri at WWDC in a couple of weeks, and to maybe even open it to third-party developers. In fact, there's a report that Apple plans to do just that, and is also working on a Siri-powered home speaker.
Unless Apple really does these things — and keeps doing more — I will regard Siri as one of the tech world's biggest wasted opportunities.