There's builds where you can open with multiple ambushes( technically triple ambushes with NELF) but rogue's losing a lot of utility. Nothing game breaking for the class though. Others would disagree. However good rogues can be class countered in MOP, where as of where the game stands now, a good rogue can beat anyone of lesser skill, in MOP certain classes can trounce them regardless of skill. (But that's just my opinion)
Like what verh said, they'll be where warriors are now, warriors are viable against any class that can't heal/kite regardless of skill.