Well, I'm not quite sure if we talk about the same thing. Fact is that the size of images used as input for krpano is 8192x4096.
I do thing that you mean this by export, don't you?
Due to performance and data reasons we scaled down the size of the images to 1024x1024 for a cube face.
Therefore we have 6 cube faces for each panorama with option tilesize=1024 and level=1.
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Source code
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<image type='CUBE' multires='true' tilesize='512' />
<level tiledimagewidth='1024' tiledimageheight='1024'/>
...
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For the Ipad you are right, the size is fix to 1024x1024 for a cube face.
And we also have the 6 cube faces for each panorama as above.