Or HaChaim on Leviticus 11:3/אור החיים על ויקרא י״א:ג׳

1 כל מפרסת פרסה, Whatsoever parts the hoof; Chulin 59 explains that any beast which has cleft hooves also ruminates except for the pig. If the Torah nonetheless says "every animal with cleft hooves…is chewing the cud," and subsequently mentions the pig as being the exception to this rule, there is a deeper reason. Rabbeynu Bachyah, quoting a Midrash Tanchuma, states that even the pig will conform to the pattern of chewing the cud in the idyllic future foreshadowed by our prophets. The very word חזיר from the root חזר, to return, i.e. to reverse oneself, alludes to that future in an ideal world when even the pig will revert to being a pure animal fit for consumption by Jews. When viewed in this light, the fact that the Torah commences with the words כל מפרסת פרסה is quite appropriate as it does not exclude anything in the long run.