"It’ll be a new product, which will be “unexpected by most," and which will be separate from a Tesla/SolarCity product unveiling on the 28th."
The Oct 28th unveiling is will include joint products from both the electric car and the solar energy companies, including a solar roof, along with an integrated second generation of the Tesla Powerwall energy storage solution, and a Tesla EV charger.
The new information Tesla will be revealing on Oct 17th will be something new on top of all of the above."
Link: https://techcrunch.com/2016/10/09/tesla-to-unveil-unexpected-new-product-october-17/
