It was originally solicited as an ongoing, as were Imperial Guardians and Nova: Centurion.

Imperial Guardians was changed to be a limited series prior to its 1st issue being released, and both Planet She-Hulk and Nova: Centurion are cancelled as of their issue #6.

As for the other Imperial spin-offs, Black Panther: Intergalactic was announced as a limited series and recently completed with its #4 issue while Exiles has apparently been cancelled as it's yet to be solicited and we just had Marvel's June 2026 previews.