It actually states that there is expectations of .5 to .8 seconds to be gained along the the whole year - and quote: "lets see who gets there first". So its not actually talking about Ferrari at that point.
Also, the car that will be presented will apparently be the first iteration of aero, and will be tested only in the first session. The second package is already in the making and will hit the track during the second week of testing, and will most likely be the same package for the first GP. This seems to be in line with other media