
The set will have Ignos, of course, but it will also have the Fallen Angel and Hellcats. In addition to that, there will be several new scenarios that you can use instead of the ones from the Inferno box. Of course, those scenarios make heavy use of those characters. Of course, if there's new quests, there has to be new rewards! Who doesn't love new loot?
The box isn't a Kickstarter exclusive, but there's some question over whether the set will be a regular retail release or not. So if you're interested, you may want to jump into the Kickstarter campaign. There's only 6 days left.
Source