I don't see it as all THAT big a step...
All it does is allow ITF Dan holders to compete in WTF events (and vice versa). Since the Kukkiwon has long been more than willing to issue rank equal to that held in another org, this is something that has always been possible (although I do not know if any of the ITF splinters issues assimilation ranks in this manner).
It's a step, but it's not earth shattering.
correct from a KKW/WTF perspective!