It doesn't look like sunburn too me. Sunburn would have made areas of the leaf die and blacken, not discolor the entire leaf. Have you unpotted to check the condition of the roots? That's usually the first thing to do when a plant has problems, because most of the time the problems come from there. But seeing as the very newest leaves are affected and not the lowest one yet, it might be something like crownrot. Have you gotten water in the crown?
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Camille
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? It looks to me like it could possibly be due to sunburn. You mentioned that you moved it from a north-facing window to one that's south-facing. It's possible that the sudden change in light intensity fried it. I've never been in that situation, so I'm afraid I don't have any advice or thoughts about how bad the prognosis is.
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