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Update:
The filter will indeed overflow the tank in the event of a power outage.
Assuming the bottom of the intake is low in the tank, which they always are, the water will backsyphon from the higher end of the intake (the part in the filter) to the lower end of the intake (the tank). This will easily overflow a 5G tank.
My solution was to put a small hole in the intake tube a little below the normal water line in the filter. The water drops, air goes in and breaks the syphon. The downside to this is the filter will not prime back up with the power comes on unless you put enough water back into the filter to cover the air hole. That's better than having a massive water leak though.
--Colin
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