This question is from a webdesign perspective: where on the profile will the apps be placed and are they movable? I realize that the apps can be placed either on the right or left columns, but are they restricted to a certain area or can we place them anywhere? I read all the documentation but found nothing that concerns this.
Also, will the app containers be classed so layout designers can integrate them into layout designs? Over the past months, I've perfected the art of premade layout designs without resorting to div overlays or flash, but apps are layout killers as they currently exist. View my work at http://www.layouts.us.com/layouts.aspx and you'll see why I'm really concerned about this.
That said, I'm developing an app right now that allows users to change layouts on their profile on-the-fly.