Longbow 2 exists, and since the Empress Wave originated in the Galactic core many years before 1116 (the point at which the two realities diverge) then it should exist in the GT timeline. But, as I asked, have they dropped it as an idea, never to pursue it?
Oops, I've just read my original question, I should have said "GT includes the possibility of...".
Still, it gets people talking
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The beauty of CT LBB1-3 is that the ref is free to make such decisions for themselves.