Pixel Launcher update brings new features to the OG Pixels

Old (left) vs new (right)
The tweaks brought by the update are somewhat minor, but nonetheless help bridge the gap between the two generations of Pixels in terms of UI, at least. The first change becomes apparent on opening the app drawer. Before the update, the app drawer on the original Pixels used to have a simple "Search Apps" field at the top, but now it's been tweaked to match that of the Pixel 2 and Pixel 2 XL with a rounded search bar up top. Like the home screen Google bar widget, the new app drawer search bar initiates the Google App, complete with your search history, rather than simply searching through installed apps.
If you are running Android 8.1 on your original Pixel or Pixel 2 XL, this update should roll out to your device soon.
Things that are NOT allowed: