In what looks like a much welcome news coming from BUILD, the start screen backup and restore seems coming with Windows Phone 8.1. This has been one of the biggest niggles with the cloud backup and restore in Windows Phone, where one needs to re-pin and arrange the tiles every time you do a backup and restore due to whatever reasons. But now in Windows Phone 8.1, not only all tiles on start screen are restored abut also the images in them are restored. So, you get your creation back!! As mentioned in the above slide,
Every Live Tile gets restored
All images and Icons are maintained
Tile grayed out until ready to work
Launch context is preserved
Thanks Din2 for the tip. Cheers!!