Well participation in spesh numbers has been going down over the last few years, meaning less and less of the top end scores are students doing spesh (although i am sure there are still a lot there); hence with less people i would assume it wont be 2007 type agg/atars; in saying that though im sure this modification will change things slightly, thankfully this has come at the best time for those currently doing spesh, just the sort of boost i needed to rev up study before the exam.
Also, it is very ambiguous, but perhaps the increase of the scaled mean by 3 will have a lesser effect on the higher end scores; so that for those getting say a 40 raw only get an extra 1.5-2 and those up at 50 only get an extra 0.5-1ish, meaning that a 50 will still only scale to a 52/52.5ish?
As a side note, it didn't say that they forgot (did it), more re-revised an outdated policy where they didnt include year 11 scores for scaling calculations because back when the system was implemented only around 11% of students did a 3/4 in year 11, nowadays its more like 50% so they have decided to re-revise....tbh I simply see this a ploy to encourage students back into spesh