DRK 'plans to' implement ring signatures, so it will finally have real privacy and possibly be able to catch up with Monero's advanced crypto technology. But that will require a very hard fork.
I thought I heard something similar along those lines. I am guessing that would involve a major rewrite of the Bitcoin core. That is why I see more chance of a zerocash implementation if they provide a reference based on the Bitcoin core (How likely this is I don't know?)
Why do they need to 'catch up' to Monero - I guess you spent too much time in all those Monero self-moderated threads.