I agree about Lightroom Mobile; it's a pretty stunning app, and the new beta is SO much better than expected. As far as IPTC, a new product is in the App store called MetaGear, I highly recommend it if you need to do batch IPTC operations. After I'm done, I FTP the pics to clients. For large jobs, I still need a Mac Pro, but for on the go work, those two apps are great when coupled with a 12.9" iPad Pro! I though the Apple Pencil was gimmicky until I edited 50 photos in the field with these two apps.