I found the following video on YouTube
https://www.youtube.com/watch?v=R8KlX2OFg-s
which discusses four space telescope designs being examined by NASA:
LUVOIR, similar to the Webb, but larger, and for visible light; an advanced X-Ray telescope; a telescope specifically designed to study exoplanets; and a far infrared telescope intended as a successor to the Webb.
John Savard
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