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I like the expertise dice system, and think it could work well for a rogue.  The maneuvers such as parry can really help out with the rogue's fortitude in melee combat (and fits him being an agile melee fighter for that archetype), and the other maneuvers help in situations where a rogue can specialize (Tumbling Dodge for combat mobility, Controlled Fall for reducing damage, reducing the damage on a reflex or will saved spell to demonstrate their nimbleness and mental prowess against such skills).

That being said, Sneak Attack should NOT be apart of this system.  Deadly Strike fits for the fighter, what with his supply of large combat maneuvers and options - he can make the choice between, say, Deadly Strike or Cleave, or other such spells for what combat requires.  But rogues really only get one combat maneuver (Sneak Attack), although parry comes close.  So for the rogue its the choice between "Being useful in combat" or "Playing like a rogue".

A rogue could be reasonably expected to strike with a d6 or d8 weapon with 16 dexterity, and thus would have an average damage per attack of about 6.5-7.5.  Given that ranked rogues would likely only attack once every two turns (since they need to hide), and melee rogues likely would have to dip in and out of combat, I think the damage should start at 2d6 at level one as it was in the previous version of the Playtest.  Although the damage doesn't need to increase by 1d6 every level (1d6 every odd level, or even lower, depending on what fits to match sneak attacks with the total damage progression that players are expected to make).

In addition to the fact they want to give more mechanical weight to rogue schemes I think it'll work pretty well.

Oh yes, I'm also looking forward to a two-weapon fighting rule or feat which doesn't mean it disables Sneak Attack for trying to fulfill the popular dual wielding dagger rogue assassin concept. /: