No widely recognized official Apple/iOS emoji design for Three Speech Bubbles is known, so any appearance should be treated as conceptual rather than an unreleased Apple character. In proposal imagery or mockup form, it would likely have appeared as three overlapping rounded speech balloons, possibly white or light blue with dark outlines or shadows, arranged like a chat icon used in messaging apps. It might have resembled a stack of comic-style dialogue bubbles or a social media comments icon, visually related to the existing Speech Balloon emoji but implying multiple speakers instead of one.
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Emoji History The emoji code/ image log of changes.
This emoji was one of the "suggested emojis" the Unicode group unveiled in June 2014 [article], however, it has been, and still is, up to the companies who support emoji in their operating systems to provide not only images but also an algorithm to replace the emoji code into the emoji image.