Def Leppard "X" - what is this?

This is a longshot, but here goes...

I've come across what appears to be a European import of X, the most recent album by Def Leppard. It includes "Kiss The Day" as a listed bonus track.

However, the disc itself has an added "2 in 1" designation, and also includes the first seven tracks from the band's last album.

What gives? I can't find any information online, and there's nothing at all mentioned elsewhere in the packaging. This doesn't look like a boot or a promo, either.

The only release I can think of in recent memory that followed a similar format was the reissue of Michael Penn's March, which also included almost all of the tracks from his subsequent Free-For-All album.