shashinehal,
I'll try. Hopefully, I've understood your question correctly.
Firstly, the preadjudicated figures in the USCIS Dashboard represent cases where a visa wasn't immediately available after all processing was completed to the point of approval. Since EB2-IC doesn't have very much Consular Processing, the USCIS numbers should match the DOS Demand Data quite well.
We know that, going into this FY, EB2-IC had about 8k pre-adjudicated cases left where a visa had been requested but was not available according to the DOS Demand Data. The figure in the USCIS Dashboard data can't be higher than that.
Since the PD has been Current since November for all possible EB2-IC cases that could be adjudicated after the July 2007 backlog, no further cases could add to the pre-adjudicated total - they would just be approved.
Now to address your main question.
Despite what the May VB says, I don't think it is possible for Cut Off Dates to even remotely approach May 2010 next year.
According to DOS own
document, the Cut Off Dates can only move forward as far as the date of the first person for whom there is no visa available.
By October 2012, many if not most, of the applications submitted up to May 2012 will be pre-adjudicated. At that point they will show as Demand to DOS. If all the cases are pre-adjudicated, that number could be as high as 45k.
In that case, for DOS to set the Cut Off Date back to May 2010, there would need to be at least 45k visas available to EB2-IC. Whatever the actual number, it is a very large number. Clearly, that will not be the case.
In reality, EB2-IC may only have 20-25k available for all of FY2013 - enough to move the Cut Off Date towards the latter half of 2008 as previous posts have discussed.
If Quarterly Spillover (QSP) is employed again, then maybe 6-7k might be available in Q1 FY2013. That is about enough to move the Cut Off Date 3 months.
I am at a loss to understand why CO put those words in the May VB. About the only way that I can think of where dates could move to May 2010 would have been for USCIS to have stopped processing EB2-IC cases from April onwards, ensuring that very little demand was apparent to DOS in October 2012. Then, within the law, the Cut Off Dates could advance, much as they did at the beginning of this year. Even that strategy would require the dates to retrogress heavily the next month.
I hope that helps you.