I have not heard any firm date, Q1 next year would be Optimistic.
Also remember that this wallet is called a reference wallet, its designed for lite wallet companies (Like Jaxx or Coinomi) to use in their products. It’s not confirmed that it will be avalible directly to end-users like you and I due to a lack of customer support infrastructure at Zcash Company.
See Lindas comments here: Technical AMA w/ Zcash team December 14, 2018 noon PST - #61 by lindanaeunlee