Tonight's BBC report
One big thing I took away from this is that the Australians appear to be taking a larger public role, as is the NTSB. That's good.
The other big thing is the AMSA guy saying there were multiple SATCOM "keep-alive" pings, and their records are available. They have some more processing to do on those pings.
They're also saying the aircraft may have been on a 180-degree heading, but they didn't say where that track began.