Here's your look at five stories we're following today:
1. New defense secretary: President Barack Obama is expected to nominate Ashton Carter, a physicist with years of experience at the Pentagon (and 1972 graduate of Abington High School), as the next secretary of defense.
4. City Hall tree returns: The official lighting ceremony for City Hall's Christmas tree -- absent from the courtyard during the past two years due to Dilworth Park construction -- takes place this evening.