Well, it all depends. "You" is ambiguous. If "
You" is the second person plural or otherwise a "
generic you" than it is proper and a well constructed English statement. However most people won't view that you as the second person plural since that is not the most common use of "You".
"What Niners Are Watching" is good but, it would be better to use the generic "others" and have "What Others
Are Watching" is a wider scope that includes visitors to the site and active participants ("Niners") .
Though it seems to be a "New On Channel 9" to me (since it is showing
the latest two videos). Is it really the latest videos or will it be by number of hits (in the past x hours) or some other metric that would mean that a more popular older video that's currently being viewed would be shown where a brand new, but a video appealing to less people, wouldn't make the list?