It is not going to be similar to FY2012. There was a need to build inventory in FY2012. CO did it to have inventory build up so that there can be pre-adj cases which can just wait for getting numbers.
Sep 2011 visa bulletin:
http://travel.state.gov/visa/bulleti...etin_5542.html
Oct 2011 I-485 inventory:
http://www.uscis.gov/USCIS/Green%20C...001%202011.pdf
The dates for EB2I were Apr 2007, in Sep 2011 bulletin. As per the Oct 2011 inventory, there were only ~3500 applications that he has after Apr 2007. Hence he needed to build inventory, as every year EB2I gets a huge spillover (15000+). With the 3500 inventory, he would not have enough pre-adj cases and hence the need to push the dates.
I believe it will be similar to FY2010. The dates will stay where they are for the first 5 months and then move ahead gradually and jump ahead in the last two months.