The latest release of the ArcGIS Runtime SDK for iOS is here. This time there aren't any new features specifically targeted at iOS developers, but the release does include some great new functionality (Geotriggers, true curves, floor-aware maps, standalone mobile geodatabases, improved symbology and labeling control) and of course the usual performance improvements and bug fixes.
Take a look at the overall ArcGIS Runtime release blog post, the 100.12 release notes, and the Toolkit blog post.