Launched to much hyperbole back in September, Google Instant is now making the transition from your desktop browser to your mobile device. Those of you graced with the goodness of Froyo can now experience the same mind-melding AJAX tomfoolery on your handset as you do on a computer. As in the desktop version, Instant is an optional function and you can easily switch it on and off right from the search page. You may have also noticed that it requires significantly faster internet connection speeds to work properly, so in the case of a mobile device you're probably best sticking to using it only on WiFi or in strong 3G/4G areas.
Open GApps can now optionally install Google Assistant
These are all the apps and services that will work with Google Home [Continuously Updated]
[Update: May enable Google Assistant on non-Pixels] Google App v6.13 "alpha" appears with support for Payments on Google Assistant, and prepares enhanced Offline Search, Lite Mode, Recent page, and much more [APK Teardown + Download]