Those who have purchased “Halo: Spartan Assault” for Windows 8 devices or Windows Phone 8 to date or purchase prior to December 15, 2013, will be eligible to purchase the Xbox One version of the game at the discounted price of $4.99. Xbox 360 owners can expect “Halo: Spartan Assault” in January 2014.
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In a related news, Xbox One is now in stock at Amazon priced at $499.99. While in stock, it may still need extra 1-2 days to process.
Via: Xbox