It's possible that the BBC might have learned that there is Doppler information available from the spectrum of the ping signal, which is perhaps possible. *
Then again, on their "what we known" page
BBC News - Missing Malaysia plane: What we know their 777s appear to be -300s with 6 doors.
* How big an effect?
It's small - on the 40 degree arc, flying towards the satellite at 200m/s - only of order 1 part in 2 million, so it's not likely to be of any use.