I'm mad curious because I don't see this anywhere else (hey, I Googled!) but on the Gmail interface, the word Gmail has been replaced with the words Google Mail. The only place (so far) that hasn't sported the change is the Gmail sign-in screen.
Intriguingly, there seems to be just about zero commentary on this ... at least as far as I can find.
Is Gmail rebranding? It certainly looks that way. But why on the q.t.?