A New Size for iPhone Wallpapers?

I trust that you have seen the new iOS7 announcement today and have seen the new parallax homescreen wallpaper effect.

To achieve a parallax effect the background image must be stretched in size to cover an area larger than the home screen, this is to allow for viewing from different angles.

My question is this:

Will the iPhone wallpaper change in resolution?

Will this be the end of this style of wallpaper?

What resolution will we need?

(This will depend on the depth of field and the viewing angles so it will be hard to calculate without seeing the os first)

I'm not bothered about your overall opinions on the iOS7 design - some of it is good (the weather app looks great), some of it is bad (namely some of the homescreen features).