In Hulk #440, the Army tried to take Hulk out with a gamma bomb. And the world thinks he is dead.
Now the Avengers try to foil the rest of Leaders’ plans, which basically involve blowing up a bunch more shit.
Also, since Force Works is now disbanded (and Iron Man is a 16-year-old), Hawkeye and Scarlet Witch rejoin The Avengers. Honestly, though, there are so many characters popping in and out of the series right now it’s really hard to tell who’s in and out.