The game director already stated in an interview that they are looking at Subtlety's identity and rolling back some of the shadow magic nu-Rogue garbage to bring in more of the 'classic PvP archetype' of the Subtlety Rogue.
After the interview, I tweeted at him directly asking if it was indeed legit and he responded by liking my tweet.
I think the current tuning of the spec is also consistent with the view that they are unhappy with the current design and planning to make significant changes in 9.0.
We'll know a lot more soon.