Icarus the Phoenix is one of the new heroes that will be introduced on Dota 6.68. Even though IceFrog hasn't reveal anything just yet, but at least we got the Icaru's picture ^_^".
Here IceFrog quoted about Icarus The Phoenix in a written question and answer on his blog ...
Q: Can you tell us something about 6.68?
A (Icefrog): It is still a work in progress and needs some time, but it will have new heroes, more balance improvements, and some new features as well. Here is one of the new heroes in development: Icarus, the Phoenix