Unfortunately we don't have a date on that.
The current Lua lib (LuaSec from LuaAIO)that facilitates TLS on FlexHub has a bug in Windows only, that freezes the entire hub once a socket becomes a 'ghost'. This can happen when an ISP resets the connection or when traffic is interrupted unexpectedly.
The author of LuaSec has looked into it and confirmed the bug, but hasn't got the time, or the interest, to fix this. If you know someone who can code, and can fix and compile a fixed and updated version of LuaSec, please let me know.. Then FlexHub will be able to support TLS on Windows.
Meanwhile we're looking at a possible way to work around the problem, but that will take some time and we're not sure if that will work. As soon as we have more news about this, we'll post it on this forum.