On the ‘special’ non-customer facing Motability website (the one we are not allowed to mention or provide a link to but I think most members here know of its existence), an item dated 2nd December 2021 has appeared regarding lease extensions as follows:

It obviously doesn’t specifically rule in/out extending a 5yr lease, but does state:
Which customers will be lease-extended?
All car and WAV customers will receive an automatic lease extension if:
Their contract ends on or after 2 December 2021.
They have not yet ordered a new vehicle.
Lease extended customers will receive a new Certificate of Motor Insurance or temporary cover note from RSA Motability for this period.
So, taken on face value, if you haven’t ordered a new vehicle you may get an extension?