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Normally I don't report on gaming news but in this case I think it needs to be known (apologies if this has already been reported)
http://kotaku.com/dont-update-your-ps3-today-update-firmware-pulled-514213464
According to Kotaku if you update your PS3 to the new firm ware there is a chance it could brick the entire system but so as long s you don't accept the update you are fine.
Now in the post it states they are looking into it but it doesn't appear they have a fix yet i'd suggest until they do just don't accept the update at all. Better to wait and let them fix it first.