Wrap the tanks in styrofoam or cardboard, or even blankets, to keep them warm. Also, try to get your room temperature really toasty, even uncomfortably so, before the power fails. By morning you'll be freezing again, but with any luck it'll stay warm enough for long enough to prevent any problem.
I don't know what kind of filters you have, but if you can keep them flowing with some airstones, then do it. You are correct in that the filters are going to be the main problem. If tha won't work, then those battery pumps will work well enough for the tank, but you'll probably have to clean and restart your filtes once the power returns. IF you just let the filters restart after having let them sit idle for 8 hours, then you'll be pumping vile stuff indeed into your tank when the power returns. This may or may not be a big problem depending on how clean or dirty things are already. Your best bet is to go ahead and clean them now, so they're not too dirty on monday but still barely recolonized with bacteria. Clean the gravel, too. Then you don't have to worry.
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