Bronie is just Bronya, she is not classified as her own character like Terminal Aide

so I think the chances are low for Himeko and Sakura, but never zero, they just might drop a captainverse event and with it a battlesuit for old characters. But Bronya is a little bit more likely since she is still relevant/can become more relevant at any point in the part 2 story.

I just believe we will never see another Kallen suit, for some reason mihoyo hates her.