I am a wildlife photographer and I travel extensively to remote areas where there is no wifi and no internet. For several years I have been hoping for a iOS version of PM as it would allow me to quickly cull, rate and keyword my images without lugging a laptop into the middle of nowhere. It might allow me to bring an extra lens. I don't have time to edit photos while on the road, so this is always dealt with when I return home. To me, the most important features would be: ingest, cull, rate, keyword.
Please, please, please, create an iOS version of PM.