First of all, ehm, congratulations to those who have received offers last month!
In March, there're many schools who hold Open House events. Hopefully you'll get to know better of your schools and professors in this month.

For those who haven't received offers, myself included, this is the month that we've to endure.
I do not want to crush our already little hopes, but March, usually is the month where many rejections are sent.
I personally believe that my chances are better if I hear no news until April, which I believe to mean that I'm in the wait-list and not in the sure-reject candidate list. Fair to say that the ones with offers would reasonably wait until April before declining some of their offers, which could mean that no extra offers will be made before this is done.
I'm down to three schools: Columbia, UIUC, and Oxford MMathPhys.
Honestly, I don't think there's a reasonable chance except maybe UIUC.
Columbia's CMT only has three professors while Oxford MMathPhys had rejected me last year.
I'm starting to prepare for the European/Japanese admission cycle, probably this will be a long game.
Let's hope for the best!