Before we go any further: Google's local delivery service Shopping Express is still limited to portions of the San Francisco bay area, Los Angeles, northern California, Chicago, Boston, Washington DC, and New York City. If you live outside of those areas, go ahead and skip this story, because Google Shopping Express (and similar competing services) aren't expanding outside of the densest US urban zones anytime soon. But for those who do qualify for the service, version 3.0 includes a new user interface.
New above, old below.
The app has been redesigned from the ground up, more or less, conforming to Material Design guidelines. Though the Shopping Express app doesn't use any of the fancier Lollipop animations, it does get a themed notification bar and a considerable boost to readability. And of course, it fits in with the rest of Google's redesigned apps. The functionality is intact (including the notification options from the last major redesign), though there are a few more hooks for the premium subscription service.
The APK is signed by Google and upgrades your existing app. The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way. Rather than wait for Google to push this download to your devices, which can take days, download and install it just like any other APK.
File Name: com.google.android.apps.shopping.express-v3.0.0_(Apr_28,_2015)-111-minAPI14.apk
Version: v3.0.0 (Apr 28, 2015) (111)