It's written at the top of the main website once you click-through from the landing page in big orange text! In 8 days - R52
Well if the countdown banner at the top of the page is right, currently "8 days to release" https://www.shroudoftheavatar.com/?page_id=29385 The link later in the page to the Events Calendar states " Mar 27, 2018 – Release 52: Launch Candidate " but I suspect it will take quite a disastrous set of things to make that NOT the release date...
Technically id say its already launched, so this is the launch/launch/launch date... wait no thats not right either its a Launch Candidate!