With the recent addition of PSP-PS3 interconnectivity, it's only natural that there might be a few bugs in the interconnectivity which could result in PS3 hacks, or vice-versa. What's funny is that no actual exploits have been found. Just like the last one, the new firmware 3.02 offers nothing but 'Security updates'.
We really wouldn't mind that, if it wasn't for the changes or rather, the lack of them in every update. We don't really know what's the deal with Sony lately, but it seems like they're trying to release firmware updates almost every week.