I'm excited for this adaptation. I haven't seen their adaptation of War & Peace, but the IMDB ratings/reviews are strong even though not extremely strong.
Even with many new adaptations being made over the years, most actually aren't extremely strong. So I should temper my expectations some, even though I will probably end up rating this adaptation at least 9 out of 10.
There are many shorter/medium length versions. What I think we need now is a 30 hour long version that is live action and dramatic. The 2007 Japan version was extremely long and extremely great overall. However some stuff was removed, some stuff was changed, some stuff was added, and the tone was too bright. The 1971 Spain adaptation was extremely great and extremely dramatic, however it was only seven hours long. I don't remember too much new stuff being added to it, but with a length of only seven hours it wasn't complete enough for me. I don't remember it having weird changes to the story though. There was a 30 hour long Vietnamese version released in 2013 though, which I will have to purchase soon.
There is a version being made that is expected to be around 25 hours long, but I am not sure if it's still in production:viewtopic.php?f=9&t=2779
The holy grail of all Les Misérables adaptations is probably the 20+ hour long 1974 Mexico TV series adaptation, of which only the first half is available since the second half may be permanently lost.viewtopic.php?f=9&t=2819
Unfortunately I don't think we will see Gavroche's brothers and the Elephant in this upcoming adaptation. It seems to not be enough of a focus for filmmakers, and the length of this adaptation will be too short.