Everyone knows this is just the first part of his transformation... right?
The 'wings' are the hands of what is to come.
Ch342_p15- has a picture of the hands closed... and I think it just looks strange with the size of the wrists vs girth of the hands/wings


If I had to guess, Sasukes further transformation will:
Increase the length of the fingers to make for more 'wingspan'
extend those small spike things so they surve a purpose
add spike holes on his body so they can retract and extend for that 'ultimate defense/offense' thing
add a tail as well


what you are looking for is what evens him with naruto in 'special features'
naruto is covered in defensive chakra / sasuke in spikes
naruto has kyubi hands that extend from body / sasuke has extra hands
naruto has kyubi tail / sasuke has strange tail


I dont really like the way the 'monsterness' the manga seems to be going as I liked the ninja on ninja battles much more, but the relationships between the characters is way to much to think about walking away from.



"Kakashi has never been touched"
Zabs got him with a kick in the beginning of the fight - which knocked him into the water for the prison