Please go have a look around and then come back. Here is the massive problems that I see that they are resolving.
Problem - Lack of conversation starters/passion points
Most online communication are usually formed around a passion point - (Forums - IntheMix - Dance Music, 4Chan - Anime, BigFooty - AFL). With ChatRoulette where they struggled was having a passion point (which wasn't wangs). SHC starts in a role play scenario - you can talk about superheroes but they compliment this with 'Ice Breakers' which are conversation starters which you can drop into the chat.

Problem - Creeper Stalker Pedo Stigma
Online chat has always struggled with the Creeper Stalker Pedo Stigma, SHC starts conversation in a state that is the furtherest place away from creeper single stalker male territory, role playing superheroes. We aren't going to get to A/S/L questions of the bat.
Problem - Sign Up processes suck
Signing up is slick, Facebook Connect - remembers you for the long term. Then finishing the sign up is a bit of a game in creating your own character, which is a nice easy process.

Problem- Actually connecting with people after the experience
You can reveal your mask at the end of it, such a nice simple fit with the whole superhero theme

They have a created a number of nice solutions/mechanics which I will be taking and using in future projects.