Essential reading from Mathew Sanders on adaptive UI and size classes in iOS 8. If you haven't dug into this topic already then you really need to start right now! This is a wonderfully detailed post which you'll need some time to read properly, but it's worth it.
There were a flood of keyboard apps released last week and it turns out they mostly needed users to go and switch on "Full Access". With the limitations on memory usage for custom keyboards, it's likely that developers will need to keep some functionality in the companion app associated with the keyboard. I appreciate that custom keyboards are at 1.0 right now but the wording presented to the user, requiring instructions like those in this article make me feel like this needs a little more work at the OS level.
With every release of iOS I keep expecting MapKit to include some kind of annotation clustering functionality, but until it's added we're on our own. Luckily, Filip Bec has taken the work by Thoughtbot which I linked to back in Issue 119 and extended it to create FBAnnotationClustering.