The latest Game Spot preview combined with the screenshots does give the idea that one of the groups on Onderon is an evil academy of some sort.
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The demo focused on areas of the planet Onderon, a new locale in the game...
so obviously both areas that they are talking about are on Onderon
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...Another section of Onderon that was shown had a less friendly space to explore. Due to a rather unpleasant disagreement/uprising going on, there were quite a few corpses littering the ground. This segment lets you mix it up with armored Sith troops, and it had the same party of three characters going through a series of bridges that had force fields and troops aplenty to deal with....
Armored Sith and plenty of Troops: On the trailer and the screenshots there are Dark Jedi (the ninja looking type), shoulder-robe-and-gloves-people, Sith troopers, and Lightsaber wielding Sith all attacking the main character on that area which I presume is the 'less friendly space' that they are referring to. We know who the Dark Jedi and the Sith are; but that there is another group wearing a uniform, accompanying them suggest to me that the Sith could be supporting an evil order on Onderon. They are using ordinary swords, though. The last bit on the trailer where the DS female player force chokes also features a shoulder-robe-gloves-guy as the victim -- but his head is covered again in ninja-fashion.
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The last area was an underground stretch. This is where you have your first unpleasant encounter with Darth Sion, a Sith Lord with a pretty unique look.
I though the 'first encounter' was elsewhere; but anyway this implies that there is an underground stretch in Onderon where we get to meet Sion. I presume he leads the Sith, and the shoulder-robe-people up in the 'less friendly area' of the planet.
Aren't the Krath supposed to be lightsaber users? Then those shoulder-robe-guys we see on the trailer and the screenshots aren't Krath. Nevertheless there seem to be some hints, that those guys are part of an evil institution on Onderon. The gloves could be hinting at their noble descent.
Another thing that this suggests is that after all, the Sith Lords might have partitioned Malak's army among themselves ---hence the Sith-trooper-types still running around.