Spin-off manga announced:
https://hjweb.jp/article/1428074/
It's about Lulu original timeline, where humanity somehow survive after Bravern and Isami death.
Obari posted a glimpse of storyboard with Vita, seems likely that Vita would belong to Episode 13 if they allowed to have more than 12 episode.
Asakami Youhei (Lewis Smith) said he want S2 and a movie because he missed Super Robot genre; he grateful to Cygames for greenlighting Obari proposal.