OK - i'll clear up a few things.
Spesh scaling was supposed to be +11-12 the whole time. It was +11-12 in 2006 and before. However, what happened was that more and more of the spesh students started doing methods in year 11 rather than in year 12. When VTAC does scaling, they compare Methods and Spesh directly. What they did before was consider people who do Methods and Spesh concurrently only, and not ppl who do Methods in Year 11 and Spesh in Year 12. Because of this shift to Methods in Year 11, and VTAC's lack of consideration of that factor, scaling for Spesh started to drop from +11 to about +7.
Then, last year, VTAC realised their mistake and adjusted their scaling method to consider students who did Methods in Year 11 and Spesh in Year 12 and compare their raw scores in those subjects. As a result of this, the scaling returned back to the normal +11-12.
Prior to 2006, Spesh scaling was quite consistent, so I would say that this year the spesh scaling will also be about +11.