To help clarify communications when sharing documents, Google Apps now generates emails with color coding and new formats. The messages are designed to give more visual clues to the recipient as to the type, number, and name of the documents.
Shared documents, spreadsheets, and presentations are defined by blue, green, and red coloring.
When sharing multiple documents, users new receive a clear list of document titles as links to open each document.
You can see snapshots of the new mail formats here.