Razgriz,
You could update the AFCAD, very easily, but it will only impact the spoken names of the ATC, not the models of the vertical signs and the pavement signs which refers to the changed taxiways, because these are all custom made, not done with AFCAD commands.
It's something that we should done but, it might be worth to wait for the big update that will come after the opening of the new runway, which will surely change a lot of taxiways as well.