Microsoft uploaded an overview of the major changes in the Windows 10 Insider Preview Build 18317. One of the things that jumps out a bit is that the software giant decided to decouple Search and Cortana in the taskbar:
Going forward, we’ll be decoupling Search and Cortana in the taskbar. This will enable each experience to innovate independently to best serve their target audiences and use cases. Some Insiders have had this update for a few weeks now, and we appreciate all the feedback we’ve received about it so far! For those new to this update, when it rolls out to you, you’ll find clicking the search box in the taskbar now launches our experience focused on giving you the best in house search experience and clicking the Cortana icon will launch you straight into our voice-first digital assistant experience.