The Android email app will appear as an update for most owners of a Nexus or Google Play Edition device. It seems that there are some compatibility issues, though - because, according to Google, the Play Editions of HTC One (M7) and Samsung Galaxy S4 can’t receive the updated app. Anyhow, if you can receive it, the changelog includes: enhanced security for Gmail accounts, printing, easier account setup flow, and unspecified bug fixes.
As some of you may already know, the stock Android email app enables you to access email services beyond Google's Gmail. Yahoo, Outlook, Hotmail and others are supported. The app can be found at the source link below.