Regarding the INMARSAT contribution, this is on their website:
Washington Post tracks Inmarsat role in hunt for MH370
[...]
The report added that the handshakes from the satellite – along with assumptions about the plane’s speed – helped Australia and the US National Transportation Safety Board to narrow down the search area to just 3 per cent of the southern corridor on 18 March.
(emphasis added)
It's not clear that what was announced today was anything beyond this?