Content: Killer Instinct: Season 3 Ultra Edition
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Game Description: The Ultimate Season 3 Bundle! Get early access to fighters! Includes 8 new fighters – including Rash from Battletoads, Arbiter from Halo, Kim Wu, and Tusk! Includes VIP Double XP Booster, 8 retro costumes, accessory sets, bonus retro character colors, and 18,000 KI Gold (limited time only). Rash, Arbiter, Kim Wu, and Tusk available now – all other content to be released over the season.
Everything you already own, earned or purchased (characters, costumes, accessories, etc.) can be accessed on either the Xbox One or Windows 10 version.
For more information about Killer Instinct Season 3, read this article at Xbox Wire.