An unlikely source for firmware info, but Ray Maguire of SCEE dropped this while thanking retail for their support as PS3 passed 1m units in the UK:
http://www.mcvuk.com/news/29792/Sony-hails-retail-as-PS3-hits-1m
http://www.mcvuk.com/news/29792/Sony-hails-retail-as-PS3-hits-1m
Our momentum will continue with the introduction of in-game communication in the summer, firmware update 2.4 and the strongest line-up of games through our third party partners and our own studios. Id personally like to thank our trade and business partners for helping us on the start of the PS3 journey.