It's easy to believe that SM has an array of Bakugan which are not pictured, think back to the beginning of this year and not all Bakugan were on posters then one day SM posted posters (about 3) all at one time. Remember when we sellers would call Bakugan "Mystery" Bakugan.... well this could be the case again.
I had always wondered why I saw multiple Fencers on Ebay listed as "mystery Bakugan" makes sense. I just think, if they're going to release a poster, ecspecially one that says "Collect them all" (which suggests that this is all of them and you should get them all) then they should actually put them ALL on there.