Echo is being co-produced with 20th Television. Do you think that this means we might see characters such as Thunderbird, Warpath, Mirage, or Forge? They are Native American Marvel characters who were previously owned by 20th Century Fox.
You’re overthinking this. Fox has nothing to do with the X-Men or even the X-Men movie franchise anymore. Marvel has everything 100% back (aside from the Sony bs and possibly Hulk solo stuff). Fox is probably just doing some behind-the-scenes work and nothing more.