It's the same deal as with the previous round of entrants. Up to the discretion of every other EU country for five years - i.e. until Jan 1. 2012. At that point a country can ask the EU commission for the right to further postpone freedom of work for Romanians and Bulgarians for another two years. From Jan 1 2014 they automatically have full work rights.

NB The five year period is about to end for that previous group.