Harry Porter Book Six and Book Seven -- My predition is...

I'll join the list of those making predictions about book seven in the Harry Potter series; the most important part of Book Six is understanding what Professor Dumbledore meant when he said to Snape -- "Please..."
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potential spoiler
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I'm posting my speculation here so I can check back after reading book seven -- released tonight. Please don't read further until you too have read book seven yourself;
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I think Dumbledore is saying "Snape, you must do this so we can fulfill our plans to help Harry defeat Tom Riddle; you know my reasoning and you've reluctantly agreed to my plan should this need arise. It has, time is short so PLEASE keep your word. I forgive you."