If I may add my two cents for this (wow, I haven't used this in a long time):
I loved World News Tonight when I was a kid, especially when Peter Jennings was at the desk (and because Channel 6 was the place to be in my family from 4-8). The name was iconic and recognizable, the theme was commanding and astounding (and also iconic), and Peter's reign was astonishing, breathtaking and cool (using the network letters for the words; and yes, iconic too.) so I'm so happy the "Tonight" part of the name has returned to give the iconic name it's return.
The logo looks great with it. I used to hate it because of the unrecognizable and strange thing behind the name that's used on the desk. The "Tonight" part in the name actually makes it look better.
I've watched David Muir anchor before. I think he'll do very well as main anchor. and...
I'm using the open as my wallpaper soon (if not now).