.. it's a very minor but valid project with expected delivery on January 1st 2014
If you've got good HTML5 experience and are good with JavaScript, I *highly* recommend you look at trigger.io. Unlike many "non-native" frameworks like Titanium and even the Lua mobile frameworks and Kivy (which I actually like), trigger.io has no delay in starting up -- it's as fast as native apps on both Android and iOS. It also hooks into a lot of native UI components, which results in an app that is indistinguishable from a native one that runs on both Android and iOS. If you find you need some native functionality that doesn't exist, it's easy to build native plugins using Java and/or Objective C.
It's definitely worth a look; I'm totally impressed. Combined with parse.com, and it makes building mobile apps very simple as long as you know JavaScript, CSS, and HTML5.