In the Tor Browser, you can get a new identity by clicking a button with your mouse. Is there a keyboard hot-key or combination for that?
Follow this ticket to get know when it's ready.
Information in the ticket tells it will be something like:
New Identity: Ctrl/Cmd + Shift + U
New Tor Circuit for this Site: Ctrl/Cmd + Shift + L
But for now my friend there is no working keyboard short-cut.