They have now done that (sourced from here).
"Formal Commitment to build Cathedral in the Square
Hmm. What is next? I am not personally clear where the judge goes with this, whether the Trust mounting the case will take it further, and whether the judge is going to rule in favour of the decision already made to sequester part of the insurance payout towards the costs of the transitional cathedral.
There will be a cathedral in our Square. It's gonna happen. Don't know when. Don't know what (design). Only know where!