There's probably an excellent chance that they've got this on their minds, yeah.
Since apparently Bendis suggested Legion, my guess is that they were shopping around as asking for ways to get a Son of Superman animated show off the ground without it *just* being Invincible, thus Bendis likely raised his hand with this idea.
And it's pretty brilliant, honestly. Effectively turning the Invincible show into an ensemble, and also making the setting something totally new to this era of superhero TV. You effectively mix Invincible, X-Men, and Harry Potter into one show.
I mostly can't wait to get more New Krypton and Mon-El and Jon's dynamic.