Gmail: Email from Google

For the last 3 years Google had on their Gmail.com page Welcome to Gmail as title.
Today, if you visit www.gmail.com you will be able to read Gmail: Email from Google.What was the reason behind this decision?

It can be a trustworthy factor and users will associate gmail.com to Google or it can be a legal seo solution.

Thanks God they did not use the word Gmail: A Hot mail from Google, watch Google trends for these terms:
gmail,email,e-mail,hotmail,yahoo mail