Here's the skinny. I just got off the phone with Ruger and here were my questions and the answers:

Q. What is the difference between the LC6 and the origonal trigger?
A. The LC6 has a lower weight setting and a crisper let off.
Q. How was that achieved?
A. We redesigned it to make it possible.
Q. Totally redesigned?
A.Yes
Q. What is the standard weight that it is set at when it comes from the factory?
A. They are set to be between 4 and 4 1/2 lbs.
Q. Are the new triggers adjustable?
A. No
Q. What if I want a lower poundage?
A. You can send it in to the factory and we can set it where you want it.
Q. Is there a charge for that?
A. No.
Q. So you'll do afree trigger pull weight adjustment to the weight I specify if I send it in?
A. Yes we will.