This is the new cover art for Preposterously-Pregnant Pony Problems by Kassaz. The artwork is based on this scene:

A herd of fillies and colts ran through the forum, in-between the various stalls, some disappearing around a corner or alley as soon as they came in some kind of rambunctious game. The more astute were fully aware of the environment around them, albeit outnumbered by those less astute who weren’t. One of the less astute colts was paying attention to anywhere but directly in front of him, and ran into the apex of Octavia’s protruding belly, falling over with a yelp having fruitlessly tried grabbing onto something to prevent this. Octavia whinnied, and asked just who or what that had been, and the colt now lying on his side hadn’t known what had happened at first, seeing such a hugely pregnant mare so close for the first time, eclipsing everything but her legs, not that he’d even noticed those over her gigantic grey swell, and navel the size of his fist.

To his unnerving, a second, but wide and white belly approached him, and he was beginning to feel surrounded, but then he noticed the unicorn attached to that. She signalled to her side, and the grey mass swung slightly out of the way to give the colt a view of the Earth pony mare behind it. Now he only felt uncomfortable because two adults were staring at him and talking amongst themselves, mostly. He was struck out of his thoughts with a jolt when the white mare raised her voice and he realized he’d not been paying attention to what they were telling him. He nervously stood at their command, and waited for any further.