Question about 720p

I’m typing this on my iPhone, so ill keep this brief.

My tv is a standard ( I think 420p) television. I can play every halo game fine. But I heard that halo 4 is upgraded to 720p, and that if I use my tv then it’ll look grainy or won’t fill the screen. Is this true? Because it would suck to have to buy a new tv just after preordering the limited edition.

It will be fine on your tv.