"Hey PS3 community –
We are aware that many online players have been experiencing connectivity issues since Tuesday’s patch. We have been working hard to track down the cause and fix them as quickly as we can. We’ve already updated the game with one “hot fix” since Tuesday’s release that has improved many of those connectivity problems, and we’ve got more coming, so stay tuned."
NOTE: There have been rumors suggesting that deleting your save data will improve network connectivity. Please do not delete your save data, as it will not have an effect on network connectivity. A hot fix was released at 9:30p PST last night, coinciding with the first instance of this rumor, and this hot fix is the reason many users have experienced improved connectivity.
Treyarch Developer: JD_2020