We got our hands on the APK file for the updated Pixel Launcher that will ship on the Google Pixel 2 and Google Pixel 2 XL with its bottom Google Search bar and At A Glance widget.
If you install the updated launcher on your device you'll get those changes. Bottom Google Search bar, top At A Glance widget, and new animations. The Google Search bar stays on all the screens but the At A Glance widget will only show on the first screen. The At A Glance widget will display the weather only if you have location turned on.
If you want to try the new Pixel Launcher on your device regardless whether it's a Google Pixel, Google Nexus, or other OEM made phone you can grab the APK file below at the source link. Remember you'll need to install it as a system app on non Google Pixel or Nexus devices to get the Google Now feed on the left screen.
Source: Pixel Launcher