Some concept art for Colin Trevorrow’s ‘Star Wars: Episode IX: Duel of the Fates’ has leaked. There are many illustrations of Coruscant.
In the first draft written by Trevorrow and Derek Connolly, the final battle between the Resistance and the First Order takes place on the ancient capital of the Republic. Coruscant is under the control of the First Order who built new structures.
Some of the heroes infiltrate the Jedi Temple in order to send a message of resistance to the galaxy. There’s an old tech in the Temple that can dodge the jamming of communications set up by the First Order. Then the battle ensues. Of course, the good guys eventually win.
See more concept art for Trevorrows’s Episode IX on Reddit.