Hi! For now we decided to focus on Visium data. @Florian Wuennemann is right, we don't plan to extend to more assay types.
About the second part and adding image analysis to down stream analysis, it is still an option for later, but I'm not really sure it's a good fit for that kind of "preprocessing" pipeline.
Regarding file format, we are going for AnnData / H5 format for now, and are waiting for the table specs of NGFF to be adopted a bit before we jump to that.