In an attempt to prevent and act against the PS Jailbreak Sony has made steps to make sure that it doesn't get out of hand. It's not a new firmware update, though. For now, they're targetting the modchips that make the hack possible. As of yesterday, they've managed to secure a temporary injuction from Australia's Federal Court, blocking the sale and importation of the new PS3 modchips.
The injunction means that until August 31, none of the modchip's Australian distributors will be able to import, sell or otherwise offload the devices. What's more, they have to take all the stock they already have and leave them with Sony's solicitors until the August 31 deadline passes.
Sony has from now until August 31 to convince the courts that the injunction becomes a more permanent arrangement (temporary injunctions are designed to maintain the "status quo" until a matter can be settled). If they succeed, it'll mean the end of legal sales of the device in Australia, but if they fail, then once September 1 rolls around the chips will be able to go on sale.