Let's look at this logically.
<J2010 were eventually put into the "backlog" only after 6+ months of the new rules, and that was mainly because there were 144,000 of them left to process - CIC having not had the foresight to control the number of applications between Feb 2008 and June 2010.
CIC have had less than 14,000 total applications for FSW1 >J2010 - that's less than 10% of the total that were still outstanding for <J2010 when they were put in the backlog.
So in short, CIC have a lot less >J2010 applications to worry about - and from that and a PR point of view it would be political suicide to create a third backlog, having created a second backlog with <J2010 when they promised they wouldn't.
Also bare in mind it will be at least 2 months before the first >J2011 applications filter through to the visa offices - maybe more, by which time quite a lot of >J2010 will already have their visas.
So my guess is that they will continue to process >J2010 as a priority until the >J2011 applications come in, and then they will probably treat >J2010 and >J2011 as the same priority.
I am only guessing of course - but attempting to inject some logic into it!
Wayne.