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More info can be found both on MeshPad official web page or on the facebook MeshPad page.
The viewer is well integrated in iOs, so it is automatically started whenever you encounter a 3D model in a recognized format (currently just ply stl obj off). It works with models on the web (see the second video) or with other cloud storage services like DropBox.
So for example it is easy to put a bunch of model on your dropbox account, to boldly show off them just when you need on your iPad.
Here are two videos showing MeshPad in action:
Stay tuned for the official release of the app!