Here are my slides about ViewModels and RequestProviders, but I do a lot of "in real time" explanation, so I doubt they'll be as useful... sorry!
@MarkVillacampa and @lrz are taking some time off, but hopefully they'll post a write up about RubyMotion 4. The short version:
- a new REPL is being developed that will work on device
- the code reloading that @jamonholmgren developed will continue to be supported, possibly baked into the REPL directly, we'll see
- motion-game is a new piece of software Laurent has been working on. It's an API to access the Cocos2dx framework. Big deal, because it means cross-platform games!
- WatchKit / iOS 9 support is almost there! This is the highest priority.
N.B.: (opinions are my own here) be cautious about targeting iOS 9 today, because adoption will not reach critical mass until after it is made public, likely fall. So late 2015 or early 2016 is a reasonable time, in my opinion, to start thinking of iOS 9 only apps.