As @BenedictEvans puts it:

Google is reworking Mail and Calendar from database displays to task-led interfaces. I wonder how far they’ll take that.

Really interesting and really fun to see. You might wonder what took them so long…

Source:
daringfireball.net/2014/11/g...

More:
www.google.com/landing/calen...
www.gmail.com/app
gmailblog.blogspot.se/2014/1...
gmailblog.blogspot.se/2014/1...