I don't think it's so much a Sony exclusive as it is "Microsoft doesn't exactly do digital preorders yet and it's sorta on their head to provide the service for them to be listed", but Bungie has not commented officially on this issue.
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Many thanks. Seems like it would be a no-brainer, but I hope they decide to hop on board. In my opinion, the digital Edition is the best value. I'm not interested in the physical items. After countless times buying special editions and what not, I end up looking at them a total of one time and then never again. Digital affords me all the bonuses I'd actually use, and is $10 cheaper than buying the game and expansion pass together.