Yeah it is. GameSalad will be fixing the retina icon issue so you can use it in the next version they release. It should be about 1-2 weeks until its ready. After that you can use retina icons in your game
I think the point @RUPAS was getting at was the need for a 1024x1024 icon in iTunes connect when filling out info before submitting a Binary, so if you had already done a 512x512 you had to scale it up.
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Benjamin
Cheers
Max