Unless there's some Sekrit Skwirrel Blowing Snow going on preventing it, we'd all be a lot better off if Malaysia would turn this over formally to the NTSB. The incompetence is staggering.
That said, the previous ping plots won't be released until it's in someone's interest to do so. It's probably not Inmarsat's call.
But some people know where those pings were, and you can bet their surveillance satellites are burning some fuel to take a close look.
The thread search function is down now and I am unable to locate the superbly informative post from a satellite expert made here earlier today, but in it he said essentially that there is probably not a log of the earlier hourly Inmarsat pings. They are just written to an overwritable memory buffer and it's probably lucky the last ping had not been overwritten when Inmarsat searched for an MH370 record.