Update, 27/3/18: Ark: Survival Evolved's intriguing Minecraft-like spin-off PixArk is now available in Steam Early Access and on Xbox Game Preview.
PixArk aims to offer a dinosaur-themed survival experience similar proper Ark, albeit in a more cheerful, accessible package. Its initial early access release includes crafting and base building, character progression and customisation, procedurally generated worlds and questing, eight biomes, over 100 creatures to tame and ride, a Creative Mode, plus single-player and online multiplayer modes.
Developer Snail Games notes that while multiplayer is currently live on Steam, it will launch on Xbox Games Preview in approximately two weeks. Additionally, it says that the final game will include "a great deal more content" compared to the initial early access release, and that the studio will share its development roadmap as work continues.