Was this timeframe confirmed? I don't remember the dev saying anything specifically about the date but I may have missed the post.
Solaris Coin @SolarisCoin
Everyone has the right to privacy.
From December 2017 with #Solaris zerocoin protocol #zXLR you will be able to completely anonymize transactions with $XLR .
This is posted on twitter from Dev

Solaris has had very active development and accomplished allot in a relatively short amount of time. The level of activity from the developer/founder is what first attracted me to Solaris a number of months ago, long before masternodes etc. were even mentioned.