Nethersight is listed as a special ability. It has +5 Perception and +10 Spot, which are evidently different skills.
It's heavily resistant to fire, but doesn't have the truckfull of minor immunities the 3rd Edition Devil gets. No damage reduction either.
It also doesn't have a long list of spell-like abilities or the old pain ability, but it's ranged spine attack has been beefed up considerably, making it a real ranged threat.
As an overall monster, it's much more streamlined and easy to grasp. Decently quick flyer with fire resistance, a powerful (and crippling) but short ranged attack, and decent melee skills. Fits the skirmisher name perfectly.
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