As for the copyright date.I think its the time packaging has been finalized for the cpu die.
All phenoms II X4 have 2008, even the 970 one.
All phenoms II X6 (that i have seen around the web) have 2009.
Cpus production date doesnt have anything to do with date on the copyright.And its logical ,because its about the packaging with stays the same.
And just because it looks similar going from athlon 64 up to bd,it doesnt mean its the same.It cant.
So 2010 seems most probable, as that is the year they finalized the design.