According to EA community manager Eduardo Vasconcellos, Sony has "not yet approved the promotion." They're continuing to "find a compromise" with them but no luck so far.
New character species are unlocked when BioWare launches Operation Resurgence DLC this weekend. There's 10% more XP to be earned on the new free maps.
"Unfortunately, we are not yet able to offer our Multiplayer Challenge weekends on PlayStation 3. Sony has not yet approved the promotion. We continue to work with them to find a compromise, but until then, Sony will not allow us to run the same Multiplayer Challenges on the PlayStation 3 that we run on Xbox 360 and PC," BioWare.
Operation Resurgence Challenge Weekend: Friday, April 13th at 5PM PST to Monday, April 16th 5AM PST.
It seems strange that Sony are dragging their feet given how much of an 'open platform' they boast the PlayStation Network to be when compared to its rival, Xbox Live. Rewards from the previous weekend promotion are still yet to be given out due to some players gaining multiple packs - a fix is on the way for this week, apparently.