Well, If anything live TV related is announced, I expect it to be with TWC, since they seem to be very progressive on the matter (see TWC TV for Roku). However, their current offering still is merely a "bonus" service for normal cable box based customers. Roku may be fine with this, but I expect Apple to demand users be able to subscribe via iTunes just like with Netflix and Hulu Plus. I also think they will have their own Apple-designed interface and features, with TWC merely as a backend. That way, if other providers sign on later the user experience will be very similar.
I believe this is all inevitable, but might still be years away.