The New Apple tv has not changed its looks and has not had many changes at all. The New apple tv has still the same sleek look as its predecessor , a simple black sleek look.
The main change is that it now supports up to 1080p HD. This is a long waited upgrade and for customers that have the old Apple tv is a pain as they would want to update because you can notice the difference between 720p and 1080p.
In the long run its worth it though, it may set you back £99 but is worth the full HD quality and future support from Apple.