I wouldn't expect a lot of changes for the PC version, though there will probably be some minor ones. But most of the team has already moved over to NWN2, including me. There's a few programmers staying on KotOR2 though.
-Akari
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I'm not really, but I assumed the unlockable thing was a small addition, as you said the code was in place so I didn't thing that much effort (compared to the 2 months that you guys have to polish it and such) was needed.
In general I figures we might see a new blaster, sword or armor
at least, hopefully, the game should be extremely polished because of the delay.