Its not just that they don't think it is likely to create black holes its also that the prevailing theory is that they would not be stable and would evaporate in a fraction of a second after they are created. Also if it actually did create one it would mean they are allot more common than we thought and they would be being produced around the earth on a daily basis.
They haven't actually run any collisions yet, all they have done is run particles round the accelerator. Then they are going to do some low level collisions to calibrate the apparatus so it will be a while yet before it is running at its full physics bending speed.
Fermilab had some good news this week as well, they discovered a new particle.