It's Pocket PC 2012 Phone Edition.
"Today at the Mobile World Congress 2012 in Barcelona, Spain, Microsoft Corp. unveiled the latest addition to the Pocket PC 2012 family -- Pocket PC 2012 Phone Edition. Joe Belfiore, vice president of the Mobile Devices Division at Microsoft, demonstrated a new Pocket PC 2012 Phone Edition software-based device from NOKIA, the Nokia Lumia 929 Wireless Digital Assistant (WDA), during a press conference at the show. Microsoft® Pocket PC 2012 Phone Edition software is a revolutionary platform that combines the best of the PDA with integrated wireless voice and data capabilities. With devices using Pocket PC 2012 Phone Edition software, customers can choose voice and text communication for wireless access to personal and corporate data. Either way, they're always in sync with their most essential information. "