The Allmusic review by Thom Jurek awarded the album 3½ stars and stated "Who Knows What Tomorrow's Gonna Bring? is one of Brother Jack's more adventurous dates, and incorporates all sorts of strange pop elements in the mix... The sheer spaced-out vibe is an overwhelming attraction to Who Knows What Tomorrow's Gonna Bring?, because it is unlike any other record in McDuff's massive catalog – even stranger than Moon Rappin'".[2]