Invincible Iron Man #521 by Fraction and Larroca, out today . . .
This is the start of Fraction's finale storyline, "The Future," bringing years of storylines to a head. Tony Stark is under the Mandarin's thumb and being forced to build him titanic war machines, Rhodey is filling in as Iron Man in his new armor, General Babbage is dead, Zeke Stane is brain damaged, the Hammers are falling apart, and Stark Resilient is rolling out a new project that will change the world.
I'm a bit burned out on the Larroca/D'Armata combo, but the art is perfectly adequate. They do a nice job on the the pair of action scenes, with Rhodey taking on Vibro in a prison break and Tony's much smaller scuffle with Melter (and then his struggle to save Melter from the Mandarin) in the Mandarin's barracks.
Granted, it took too long to get to this point, but now that everything's rolling downhill, there's a nice momentum to it. I don't know if it's worth picking up if you haven't been following the series, but if you have I think there's a lot to like here.