Privacy in Nano is something the Nano team is interested in, but I'm not sure how close they are to implementing it.
Seems like it should be a design rule, not an added extra.
There are only a few privacy coins (Monero, ZCash) at this time. I'm not sure why people in this thread are acting like privacy is a standard feature in cryptocurrency at this time. Also, privacy coins were just delisted from Bittrex, so it's not clear what the regulatory future will be for privacy coins.