Iron Fist's title "The Immortal Iron Fist" was 'put on hiatus' and we don't know what's going to become of it for the time being. I recommend reading it though, it's awesome.
In its place there is a mini called "Immortal Weapons" that is coming out, issue 4 (of 5) just hit this week. It focuses on the Immortal Weapon characters who debuted in the second arc of Immortal Iron Fist and made appearances throughout the rest of the series. There is a small story continuing through these minis as a backup story that stars Iron Fist, so at least that's something.
Iron Fist also stared in the most recent issue of Thunderbolts. It was the Thunderbolts's title, but it might as well have been a comic staring Iron Fist and Luke Cage... they were THAT prominant in it. And it was really good.
So that's some stuff you can look into. All of it is good, though the Immortal Weapons mini has been a little hit and miss per issue.