gaming Xbox preview and spark.

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Any one on xbox one might know what the preview program is if not well it's where you get the next console update early and give fedback I'm on the May update now. There is the "spark" thing going on does anyone know what's that is. Also any xbox one people who want to join preview msg me on Xbox my gamer tag is: zom8iekiller147 msg me saying u want to join u also have to add me as a friend so I can invite you.