According to the very first post in that thread, though, the March issue of
Mojo had a piece on
Lamb (not sure what the occasion was?) with this:
“...and summer 2020 will see the release of a new, rebooted, bells-and-whistles edition.”
That same snippet is also cited on
genesis-news.com, which adds that "[m]ore information is not available and no official announcement by the band has been made yet."
So there you go.
On the bright side: my Google search did turn up this 2014 tribute by Jon Michaud at
The New Yorker.com, "
The Ulysses of Concept Albums," which I'd somehow missed when it was published.