I haven't seen anything official.
My hunch is that based on the price of the upland vest, that it's gonna be in the $150-200 range and at that price I doubt they'll market it before Christmas 2018 - it will need field tests and reviews.
I suspect sometime Spring 2019. I wouldn't be surprised if they unveil something at either the SHOT show convention (Jan 2019) or NWTF convention (Feb 2019) - this would allow them to get comments/expert reviews and take limited orders to put it in some people's hands for Spring 2019 season