I honestly doubt that it will freeze over in that time, as the water will take some time to get anywhere near freezing temps.
If you are worried anyway, a good idea is to leave the filter pump running. Water that is still will more easily freeze over.
Of course, if you were truly worried, you could make it into a salt water pool, dropping the freezing temperature by a few degrees more.
PVC is a good choice, provided that it is properly installed and maintained. A proper installation includes shielding the PVC from UV light, which is the primary means of premature aging. UV light will eventually turn PVC into a brittle mess.
ABS on the other hand tends to not become brittle with sun exposure, but to deform and is generally softer. As a result, buried ABS pipe seems to be at a higher risk of crimping, impeding water flow.
In either case, you should paint your exposed pipe, which probably wasn't done, and is the primary reason you are looking to repair it. Personally, I'd go with painted PVC, because after it is protected from UV light, it is less flexible (less pipe collapse) has a wider variety of fittings, and generally has a wider range of temperature distributions. I'm also more familiar with PVC, which might cloud my judgement. I'd love to hear from someone intimately familiar with ABS.
Both types of plastic are generally considered for low pressure applications, if you are having consistent freezing problems, neither pipe is meant to withstand routine freezing of water in-pipe.
PVC UVR is UV light resistant PVC. Buy it and paint it if you want a very long lasting PVC solution. Basically, you will have to worry about the (in my experience) natural enemies of PVC pipe before worrying about aging, that is careless yard crews, people vigorously digging, etc.
Best Answer
In my area pealing poles the round fence posts left over from making veneer ate painted black and floated in the pool to keep ice from damaging the pool, keeping the pump room warm usually protects the pump and filter with no pressurized or trapped water we have never had our pipes break due to freezing, before someone suggested the pealing poles painted black I used to use a large thermal blanket but snow and ice on top ruined them fairly quickly, I have been using the same poles for 8 years and have had no tile damage since doing this. But our negative F temps only last for a few days and it warms up in the day time usually.