SO to EB2-I is going to be heavily dependent on EB2-WW demand and whether there are any spare FB visas.
Currently, I am assuming there will be no extra FB visas.
For EB2-ROW, assuming it takes an average of 6 months from PERM certification to I-485 approval (I think that is fairly reasonable (it fits the pattern seen in FY2014), but you can play with it), then PERM certifications from Q3-Q4 of the previous FY and Q1-Q2 of the current FY will contribute to I-485 approvals in the current FY (although not NIW or Sch A).
For FY2014 I-485 approvals, that number was 12.6k PERM certifications for ROW.
For FY2015 I-485 approvals, there are likely to be about 11k ROW PERM Certifications for Q3-Q4 FY2014, plus any certifications made in Q1-Q2 FY2015. Even if PERM processing times doubled starting from October, there will still be more projected EB2-ROW approvals in FY2015 than in FY2014. The size of EB2-ROW approvals will be dependent on when the PERM slowdown occurs and the extent of that slowdown. My crystal ball is currently broken, so I can't assess that yet

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Historically, EB2-Mexico will provide FA within EB2. EB2-Philippines may, or may not.
As well as the current Inventory of "old" cases, the July-September period seems to have stimulated a large number of first time filers within the current COD.
I expect CO to use the 3k initial allocation for EB2-I in October, but I don't think that will allow all the remaining "old" cases to be approved (I'm aware not everybody shares this opinion). Any SO (presumably only released towards the end of FY2015) will have to cover :
Approvals from a retrogressed COD from November onwards, plus
"Old" cases left behind, plus
The new applications that will be preadjudicated by that time, plus
Any new porting cases, plus
Any forward movement of the COD beyond 01MAY09.
If EB2-WW is going to provide the bulk of that SO, then it is difficult to see dates moving beyond 2009.