In a document leaked by WMPoweruser, plans for the next 2 iterations of Windows Phone appear to be coming in 2012. The roadmap shows WP Tango coming in Q2, and may be only for lower-end handsets. WP Apollo is said to be the next major update, and is expected in the fourth quarter. Apollo should offer integrated NFC support, and other enhancements.
Source: BGR
Mickey Papillon
Joey Koppes
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