The date was given in this F D post from Paige:
Hello everyone, In a similar fashion to our Lavecon 2019 reveals, we wanted to give all of you who couldn't join us at our Gamescom Frontier Community Meet a rundown of all the details that just dropped... or should we say hauled in here by the aid of... a Fleet Carrier! December Update - The...
forums.frontier.co.uk
"For those of you who have been stranded out in the black and somehow missed it, here's also a super-duper QUICK recap of the
September Update.
- This year's updates are focused on improving the starter experience for new commanders. We're adding a fully-voiced, in-game, in-ship tutorial, covering the basics of space flight, combat, traveling and scanning. Also, this experience is available in all of our in-game supported languages! Speaking of you veterans, you'll be able to access this from your right-hand panel at any time so you won't even need to wipe your save!
- In addition, we'll be reworking and rebranding what some of you might know as Frontier Points, introducing them as Arx. These Arx will be purchasable and used to buy Game Extras such as Paint Jobs, Ship Kits, Bobbleheads and more. What's great about Arx is that you will be able to earn them in-game by... simply playing the game!
The September Update will be launched
18 September for PC, PlayStation 4 and Xbox One! "
NB That is F D bold on the date above - that is the date of the update -
18 SEPTEMBER