Well, they tried...
Since AMD decided to pressure one site into not publishing news which even weren't very detailed, here is more info than was originally published at our colleagues' yard.

The products in question are AMD Athlon 64 X2 5000+ and Athlon 64 FX-60. AMD isn't going from 57 to 59, but rather from 57 to 60, then to 65 and so on, to catch up with the Opteron numbering scheme and prepare for M2.
[The Inquirer]