Brian Roemmele makes some interesting points on VocalIQ, a speech/deep learning startup that Apple acquired last year (via Nick Heer):

It is not a secret that Siri has not kept up the pace that just about all of us expected, including some of the Siri team. The passion that Steve had seemed to have been waning deep inside of Apple and the results were Dag and Adam Cheyer moved on and formed Five Six Labs ( A play on V IV in Roman numerals) and Viv.

Tom Gruber, one of the original team members and the chief scientist that created Siri technology, stayed on and continued his work. During most of 2016 and 2017 we will begin to see the results of this work. I call it Siri2 and am very certain Apple will call it something else.

Roemmele has been following all this for a long time, and he adds:

If Apple utilizes just a small subset of the technology developed by VocalIQ, we will see a far more advanced Siri. However I am quite certain the amazing work of Tom Gruber will also be utilized. Additionally the amazing technology from Emollient, Perception and a number of unannounced and future Apple acquistions will also become a big part of Apple’s AI future.

Between these acquisitions and reports that Apple is indeed preparing a Siri API for developers, it sounds like we should expect some notable announcements at WWDC.

See also: this fascinating talk by VocalIQ CEO and founder Blaise Thomson from last June on machine learning applied to voice interactions.