You can read more about this on the Evernote blog, but in a nutshell here is how this pairing will work between Evernote and Google Drive:
All the files you keep in Drive are now easier to access in Evernote. Now, instead of seeing only URL links, anyone can browse anything created or stored in Google Drive right in Evernote notebooks. With this integration, Evernote customers can add any file in Drive to their notes without leaving Evernote. And any changes to files in Google Drive will dynamically update in Evernote.
This feature is currently in “beta” and is currently only available on the web (through Google Chrome) and for Android.