I can't wait to see more details about this. I hope this isn't another botched attempt at trying to solve the cross compiled native app challenge. I've seen and signed up for so many hype machines for solving this problem including plain old responsive web apps, Adobe AIR, Phone Gap, Corona, and Famo.us. I've invested time in learning about all of these platforms, but in the end they all fell short in some way or another. I have high hopes for $FB though because I've really enjoyed most of the projects they've open sourced including React and Pop. Personally, it's been easier for me to just learn and use Swift/Obj-C. The main caveat is that my apps are limited to running on iOS.