Official Gmail Blog: Get your mail faster on the Gmail iOS app.
We’ve recently announced that we’re migrating Faculty and Staff to gmail. Yeah! I can’t wait!
Now Google has updated the iOS app to support background refreshing so email is already loaded when you launch the app. You don’t have to wait for it to fetch the data.
Also, they now do single sign-on across their other applications like Maps, YouTube and Chrome.
I think they just want to impress us.