If you buy a printer NOW which supports Windows 7 it is likely the same driver will work with Windows 8 and highly likely the manufacturer will release full featured Windows 8 compatible drivers. Kernel version of windows 8 will be 6.2 afaik.
Anything a bit older as usual the updated drivers they provide may not include ALL the gubbins you would get with the supplied CD for the intended OS, but nobody wants that rubbish anyway.
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