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A poster on the status in early June 2014 and ECMWF plans is available at UEF2014 presentations (pdf, ~10MB).
On 11 November 2014 ECMWF made a change to its global 4D-Var system to process the new BUFR reports operationally. Many are being monitored without being assimilated for now. Those assimilated initially are a) land surface reports from UK, Ireland and Netherlands, b) high resolution reports from 16 European stations plus some ASAP ships, c) WIGOS AMDAR reports. For these stations BUFR is used in preference to TAC, but if the BUFR report is missing then the TAC report will be used. Some other ECMWF systems (surface, MACC and ERA-Interim analyses) are not yet using the BUFR reports. In the coming months more BUFR surface and high-resolution radiosonde reports will be assimilated, there are no plans to assimilate reformatted TEMP reports because of the problems described in Structure.