BioWare said in a blog post: "Good news Spectres! Starting with Operation EXORCIST, N7 Weekend Challenges will extend to the PlayStation 3 platform.
"Operation EXORCIST begins today, April 27th at 6:00PM PST until April 30th at 5:00PM PST, on PlayStation 3, Xbox 360 and PC. Please remember to set the "Upload Gameplay Feedback" setting to "On" in the online options to be able to participate in this N7 Operation."
More details on this weekend's challenge can be found here.