Thank you very much for your quick response Adeptis! :)
However, I must slightly disagree; as much as it is cosmetic, it gives you an advantage, because if you see a person with two two-handed swords you just won't expect hes a bloody rogue. Simillarly, if you see a rogue with two swords, you will not expect him to be assassination, and you will adjust your playstyle accordingly.
For instance, when I see a rogue with daggers, I am very much aware he is likely to be assassination and will go for mutilates, envenoms and ruptures.
It is most certainly not something I'd expect of a rogue who has two swords (swords cannot be used in assassination, or at least not efficiently)
Also, cosmetic or not it is kind of unfair if you ask me. After all, I've spent a fair amount of my points on gear I would use for transmogs only to later find out I can no longer use it, because it has been patched.
Regards, D