Def Leppard releasing a greatest hits album
 

Just read somewhere Def Leppard are doing something similar to bon jovi and releasing a double disc or something think one has greatest hits and there will be a special disc as well as long with another disc with about 30 songs on

Similar to Bon Jovi? No.

It's basically a re-release of Vault with Long, Long Way To Go. The bonus disc..depending on which version you get..is either a collection of album rock tracks...or a DVD of their music videos.