Sean McKeever provides some answers at Newsarama:
NRAMA: You said that they have a new, refocused outlook. Can you tell us anything about what that is?
SM: It's not so much a new outlook, but more of a focusing of what the Teen Titans are about. It's more than just being teen superheroes and it's more than just hanging out on the weekends. There's a greater civic purpose, and we'll get into that in issue #55.
NRAMA: What can you tell us about this storyline?
SM: Issue #55 is a prelude for what's to come. And what's to come is a new version of Clock King, who is in charge of a new team of teen legacy villains called the Terror Titans. And what follows after issue #55 is the Terror Titans taking it to the Teen Titans.
Read it all here!