Romem, I know it sucks to wait, but just hang in there a bit longer. There is a guy in my school who is also waiting to hear back from Argentina and he is pretty anxious at this point. Just remember that everyday that passes means you are one day closer to finding out. If nothing else this is a good exercise in learning patience--which one can never have too much of. Te deseo buena suerte.
On another note, on Wednesday my school's president had a fellowship luncheon and the director of fellowship spoke about how unique this year had been for Fulbright. She said that in a conference there had been over the summer they had announced that they expected to have the vast majority of notification out by April 15, so your probably right about the last point.