You won't find anything new in terms of content, of course, if you already know that part of history. So it comes down to the footage and presentation. That is a matter of personal taste. I don't like re-coloured footage, I see it more as manipulating than restauration. And, quite frankly, the source material is oftentimes not that good to deliver good results. This is far from being HD. In fact the footage varies from good to awful with the majority below average. The colour looks unnatural and the picture is blurred. And almost everything is overdubbed. I am not sure where this "rare and unseen footage is" because, having seen many WWII docus I knew a lot of it already (and I am talking about docus older than this). And the presentation ? Well, it's like listening to an audio book with moving pictures in the background. And I am certain that they were using stock footage that fits the narration instead of actual pictures from the described event often. So far I am still waiting for "satelite-delivered terrain mapping". All I see is 2D maps with pointing arrows.
My conclusion is that for someone with no or little knowledge of WWII this could be a good starting point. If you have profound knowledge already you could skip this as the footage itself does not warrant to make it nessessary to watch this.