If amazon has the correct information and there are actually 7 discs this time in the set, there will have to be a changing in the packaging size.
Don't know if there is place for one more disc in the usually amaray version, in the steelbook versions that i collect, there is certainly not.
So, they either have to just throw in the 7th disc wrapped in a paper sheet or they have to reconfigure the box size.
Not sure, which I'd prefere.
7 discs must be an error. It should be 6 discs, just like season 1.
Disc 1: 4 episodes + bonus features, Discs 2-5: 5 episodes, Disc 6: 2 episodes + bonus features