Although we have switched to the Saga rules armor will continue to provide DR.

• Armor provides no protection against lightsabers
• Armor provides normal protection against blasters and other hi-tech weapons (primitive armor offers half protection against such weapons)
• Armor provides double protection against other 'primitive' weapons (unless we're also talking primitive armor)

Exceptions are possible; as you've already noticed the new Sith has armor that is at least partially resistant to ligthsabers.