While no prototypes have been caught yet as of this post, I do believe Opel said a wagon is coming, so I whipped one up quickly. I might make a rear view, but haven't decided yet what photo to use.
My design is influenced by the new 308 SW, so longer wheelbase, and longer rear bumper. I used the same C pillar design but kept the original Astra D pillar design. I am sure it will be different so once test cars appear, I will try to update the post with a more closer design.