Hi landwaster & welcome to the forum. In answer to your question I can't find a precise date but the Hornby catalogue states 1st quarter so should be very soon. Someone reading this who is or knows somebody in the trade may be able to be a bit more precise.
To quote Simon Kohler from Hornbys own forum pages they " should start to be arriving towards the end of this month so hopefully by Alexandra Palace, with the Standard 4 not far behind." https://www.hornby.com/forum/forum-thread.h...d.Thread-L-9798
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