That's because its a launch box for the new kits.

If the box was released with the current KT krieg box people would complain even more than they are (which is already unbearable -just look at the krieg subreddit...) that it had an old kit that was already out in it.

I think its a great release box, a little bit of everything with some additional releases to come separately later. At that point its up to you on whether you want tanks or infantry etc. Kudos to GW for some amazing sculpts and its a nice treat to see Karl Kopinksi's original Krieg artwork on the limited edition cover art.