Several weeks ago there was the interesting exchange and confusion about the published announcement of the upcoming issue. That thread come to an end on the first.
But, I don't think there was any mention of the pre-view postings of the issue on this forum. I'm a subscriber to
Trains and so I got an email announcement of the issue and preview (also I visit its website each day for the news feature). That email was sent out on the Monday 24th. So that puts it just a few days ago.
Brian Norden