Did they remove the super-power-energy-ball?
I dont' see it on the hazard signs anymore and there is a new test chamber in the "old test chambers" bit in the beginning rather than the first energy ball test.
Yeah, it's gone. It's been replaced by lasers, which are a lot better because you won't have to constantly be on the lookout for an ethereal death orb bouncing all around the level. Lasers don't kill you instantly, kill turrets, and actually look awesome.