I had to clear cookies and start a new session and log into my gmail account to see the preview version. Otherwise i just saw a 404 or the old contacts version

I had to clear cookies and start a new session and log into my gmail account to see the preview version. Otherwise i just saw a 404 or the old contacts version. In short it looks very much following material design and the style of inbox now. edit: only personal not apps account have this preview.