I suspect it's what RainingLemur said, as it does take some time to convert comics into eBooks (especially the K8 format).
CBR/CBZ is probably not going to happen soon, as it lacks DRM, and while it can theoretically be read in any device that supports the format, might not necessarily look good on small tablets.
From what I've seen of sold comics online though, PDF is more likely. (CBR/CBZ in my experience are usually pirated comics.)
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