Manganising US comicbook cartoons is always a bad idea IMO. F4 was just plain bad. I hate sideburns on american manganised characters - they always have it look like they've just grown it longer from above the ear to give the impression of real sideburns.
A new animated series is the studio (and Marvels) chance to continue the movie franchise somewhat by doing in short arcs of multiple episodes what they couldnt do with the movies because of casting, budget and fxtech. The roster could be Beast, Storm, Logan and Kurt as adults running the institute and teaching numerous kids, with the "new mutants" being those senior students preparing to become x-men and starts out as just Iceman, Rogue (using alt ending from X3 for her where she didnt get cured), Kitty, Warren and Piotr.
Prof X is missing for most of the first season as he lays low underground while he searches for some conspiracy stuff he found out about just before he died (and isnt paralysed because the body/twin he woke up never had the accident he did - but he will become paralysed again in a shadow king or magneto fight). During that time he comes into contact with some characters the movies wanted but never had (like gambit, quicksilver), or the regular team do. Scott is returned somehow along the line having been revived upon Jean's death when she expended her stored energy to reconstitute that which she absorbed as phoenix as a final act of compassion and "jean-ness".
Also, comic-like costumes are introduced at the end of the first episode when it becomes clear that in order for mutants to be trusted by the public, for those who appear in public fighting against mutants who hate normal humans, the image of black leather actually makes people fear them as some black ops team with little concern for public safety, so someone (possibly Bobby jokingly) suggests that people always love comicbook characters because of their colours and capes inspire them - so more colour and alittle individuality are incorporated.