At the start of 2011, nobody were aware about strict rules around EB1 which led to good amount of spill over, I guess in 2010 we got some thing from Family Visa section which was not predicted at the start of 2010.
If we get some thing like above two cases we will definetly move till Mar-May'08 ( I mean getting green card), I guess uscis has used reasoning like you in sending NVC receipts till June'2008.
On the flip side if we dont get any thing like last couple of years we will be stuck at Nov-Dec 2008 when we reach August'2012, again CO might likely move dates till March '2008- April'2008 ( I mean getting only EAD) for getting Demand FY2013.
According to me there is definetly chances of moving till Feb'08 to April '08 for a month when we get Visa Bulletin for October'2012.