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From what I understand the biggest advantage will likely be the ability for third-party apps to finally trigger notifications/alarms without relying on a push notification server. This would allow OmniFocus to get rid of the current subscribed-calendar workaround and actually deliver native pop-up notifications directly from OmniFocus, whether it's running or not.

As for the spell-checker, I suspect it will work everywhere across the board as it currently does on the iPad.