I bought a 2011 dv888 in Aqua from YYE a while back. Looking at the fine print on it, it says it was made on 07/01/2011. While I doubt the production date is actually accurate, I know for sure this is a 2011 edition, especially since it went from YYF, to YYE and then to me.
I can’t speak with any authority on any other versions. I know these are made in China to get costs down as much as possible(well, some countries can do it even cheaper but they may not have the factories and equipment to actually do the work).
I think YoYo Wiki could afford to have a page on this topic.