iPad Retina Display Suffix

I'm looking to put iPad retina (crazy!) quality images into my app for the 'New iPad's launch on the 16th Martch. However I can't find the correct suffix for my file names anywhere in the documents!

I use @2x suffix for iPhone and iPod retina display. If anyone else knows what it is/will be for the iPad and, even more, can show me a link to the official documents on this I'd really appreciate it.

Thanks! :-D

EXTRA:

Thought I'd just leave a bit of code I've started using to use my iPhone @2x images for the iPad non-retina ones (as most of my @2x~iphone and ~ipad images were the same and duplicates are just a waste of space).

+ (UIImage*)imageNamedSmart:(NSString*)name
{
    UIImage *returnImage = [UIImage imageNamed:[NSString stringWithFormat:@"%@", name]];

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2)
        {
            // iPad Scale 2  i.e. 3rd Gen iPad
        }
        else
        {
            // iPad Scale 1  i.e. 1st and 2nd Gen iPad
            return [UIImage imageNamed:[NSString stringWithFormat:@"%@@2x", name]];
        }
    }
    return returnImage;
 }

This means instead of calling:
[UIImage imageNamed:@"imageName"]

You call:
[self imageNamedSmart:@"imageName"]

Hope this help people a bit more. :-D

(I found this idea by goggling but I can't find the original site to link, so thank you whoever you were.)