I think Alejandro might do better than expected, but I don't think it'll get number 1. I think Alejandro's performance is resting on the music video, because that's what pushed Telephone to #1. Plus Beyonce.
I think a 4th single should definitely happen, even a fifth. I think all the songs would be strong enough to be singles, perhaps not Teeth and So Happy I Could Die as much as the others.
I think Monster and Dance in the Dark would make good choices for the 4th single. Then again
LoveGame was single number 4 and flopped.