Speaking of smaller features I wouldn't have expected to see at last week's WWDC, Bryan Gaz, writing for Digital Photography Review, has noticed some welcome improvements to camera import and RAW files in iOS 12:
Now, when you plug in Apple’s SD card to Lightning adapter (or camera connection kit), the Photos app will show up as an overlay on whatever app you’re using. This comes as a much less invasive method than previously used in iOS 11, wherein whatever app you were in would be switched over to the full-screen Photos app for importing. It also means you can multitask more efficiently, importing photos while getting other stuff done.
Now, when photos are detected on a card, iOS 12 will automatically sort through the content and determine if any of the photos have already been imported. If they have, they will be put in a separate area so you don’t accidentally import duplicates. Another new feature is a counter on the top of the screen that lasts you know how many photos are being displayed and how much space they take up on the memory card. This should help alleviate the guesswork involved when trying to determine whether or not you have enough storage on your iOS device.
I've never imported photos on my iPad using the Lightning to SD Card Camera Reader because I don't have a camera, but I know that the import process is one of the pain points for photographers who want to use an iPad in their workflows. The idea of having Photos show up automatically in Slide Over upon connecting an external device is interesting; it perfectly ties into the iPad's focus on drag and drop for multitasking and file transfers. It seems like this approach would work nicely for importing files from external USB devices if only Apple decided to add support for those too.
Update: After looking into this more closely, it appears that Photos only appears automatically upon connecting an SD card if it's already in Slide Over mode. This isn't as convenient as DP Review's original report, but at least all the other improvements mentioned in the story are indeed part of iOS 12.