They've removed `www.` from website url's in the address bar. Actually knowing if I'm on the www subdomain can be very useful, especially as a web developer checking if domains have been setup correctly. Reminds me of when windows started to hide file extensions by default.
This design decision can in practice create trouble with "mis"configured domains where www.example.com is in fact not the same as example.com. This is especially popular in traditional university domains where "university.xyz" does not resolve to a host but only "{www,mail,ftp,...}.university.xyz" does.