If you look closely you can notice that the yellow parts seem to be at the edge of the tower's perimeter itself, and not the core. So if the case is that they are erecting a 4th crane i guess it will climb along the perimeter and serve the construction of the floors and/or assist the construction of the podium section that faces sarona. I don't think they will use a 4th crane to build the tower itself as 4 cranes for such a tower might be excessive and it wouldn't have a big space to operate in, so I assume it would be a crane to help with the podium and the ground floors. I guess that if they are going to erect a crane then we will see it in a matter of days going up.
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