BU's admission makes a really good effort to be candid about the process. All that email meant is literally that they are taking longer to get to your app than they thought. It doesn't mean anything good or bad, just that you're probably going to be waiting some more before you hear anything. The people that didn't get it just submitted earlier and already have been reviewed. And even if you already have been reviewed and haven't heard anything or didn't get the delay email, doesn't mean you won't continue to get reviewed in different piles until the end of the process. Stop worrying yourself, it doesn't mean anything good or bad either way.
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