Apparently there's another Multiplayer Weekend coming up in Mass Effect 3. It's called Operation Exorcist and will run from Friday, 27 April at 6PM PST until Monday, April 30 5AM PST. If players kill a combined total of 1,000,000 Cerberus Phantoms then everyone gets a Victory Pack. If you manage to survive any map until extraction on gold difficulty, your squad gets a Commendation Pack.
I still see ME3's multiplayer as a horribly dull experience BioWare threw at me just so I could experience my optimal ending and fully enjoy an otherwise cracking game. It's not unforgivably bad, just completely and utterly uninspired and devoid of any interesting features or mechanics. Anyone still playing deserves some kind of reward. BioWare obviously agrees.