What are your requirements/expectations for the Rogue(s), in terms of accomplishments specifically in MoP?
I'm a skilled Rogue, but for a better representation of that you'd be better off looking at the dates on my Heroic achievements during most of Cata, for whatever that may be worth, simply because I haven't been in a position to raid seriously at all during this expansion.
Now, with a clear schedule for WoD I am interested in raiding full swing again. Unfortunately I fear that may be a problem in some ways, because I've only seen recent content at a basic level and honestly have little to no interest in spending much time on it, knowing it will all be for nothing in less than 3 months. I've got the Legendary Cloak, but who doesn't?
Instead, I've spent the most of my recent time playing WoD. I've got about 6 days /played on my Rogue now at level 100 and I've leveled to 100 3 times so far, I spend most of my time testing Heroic 5 mans when I can stumble into or organize a group that knows how to use a doorknob. Hard going in Beta by yourself sometimes!
For whatever it's worth, my dedication mostly lies with learning and preparing for WoD in order to be more efficient when the time comes.