That is very unlikely. GT6 is finished, Greg will only do some bugfixes now and focus on his own game. It’s however very likely that some updated from other people or an unofficial version, like with GT5, will add this feature, but that will take some time.
I myself plan to maybe expand the reactors a bit (neutron sensor, critical fuels, moderation, breeding), but can’t promise if or when I will find the motivation to do so.