I have written 3 books on App Inventor so there is no need to tell you how much I love it. If you want to learn about App Inventor, check out this series on this blog.
This move opens up a new frontier for App Inventor users. Not only can we now create mobile applications using App Inventor we can now add mobile capabilities to any internet connected device.
MIT App Inventor IoT is in its early stages and can work with Arduino 101 and the BBC micro:bit.