The Jonas Brothers are full-throttle promoting machines right now, as they prepare for the imminent release of "Lines, Vines and Trying Times," due June 15.

There's the free Irving Plaza show in New York on Thursday, announced day-of, causing thousands of excited Jonas Bros. devotees to line-up on the sidewalks for first-come-first-served tickets.

Many of the same fans likely flocked to another free set Friday in Central Park in New York, as part of the "Good Morning America" concert series.

Then there's plenty of talk of the surprising collaborations on "Lines." The trio tapped legit hip-hop star Common on "Don't Charge Me for the Crime." And of course Miley Cyrus -- ex-girlfriend of Nick Jonas -- appears on duet "Before the Storm." She told a radio host today (June 12) that she and Nick have "definitely reconnected. We don't know what's going to happen in the future, but right now we're just kind of kicking it and hanging out as much as we can."