From the looks of it, there is no common trend...some of the cases of I-485 are ones which are not even current....some cases seem to be with PD current...
From this observation, I can only say - just some kind of system maintenance or so...
Not the real good news, we all had been hoping for...
But, this brings a good point - that - USCIS should be smarter about processing applications by Priroty Date....they can request FBI to hold back on some of the older applications whose PD are far off....and focus on only those applications with PD being current or soon to be current.....
this way - it would streamline their work effort......Why waste time - processing namecheck for an application with, let's say PD of 2004 (India- EB3) now?
But, I really doubt if USCIS shares the information about PD with FBI - may be it's time they should!