From my understanding they will be working on some new variation of zk-SNARK. You can find out here: https://blog.decred.org/2017/01/09/2017-Decred-Roadmap/
Thankyou.
Do you know this compares to Zerocoin?
*edit*
Ignore that, I did a little googling its a version of the same thing I think.
Zerocoin is a centralized anon system that needs trustworthy on dev.
Decred system will be decentralized and trustless
It's not, really, although it was broken and allowed the generation of like 300k coins, but at least they didn't roll back the chain. Zerocash is the one with the trusted setup. Zerocoin uses RSA factoring challenge number for it's setup.