I just googled fever coat. absolutely beautiful color. I think StefanZ might be right. Check it out when you google it you will see some awesome examples of kittens with fever coat.
I wonder if the coat is a so called fever coat. The different shadings - dark forehead, lighter ear parts - makes me believe it. In that case its a bit difficult to foretell what his coat will be exactly as adult. It WILL become "normal" coat, dont worry its anything problematic for him.
But the exact looks are difficult to foretell.
Good luck!