Hi @BertG, apologies for being so slow. I was really excited to read all the in-depth feedback in this comment thread and then got stuck doing everything but this. Anyways… Thanks so much for pretty much filling in for me, along with @urs_lesse, @paulakreuzer, @Stefan and so many other awesome community members helping out with questions.
About the specific question: It’s exactly like you suggested above - A (bio based) rubber protective case, that wraps around the side of the phone, like the bumper would, but covers the back as well. There are currently no plans to offer alternative back covers, as we’re focussing on more functional accessories first and a lot of you have been asking for a proper protective case 
I’m in the office for the rest of the week, so available for more Q&A’s, if there’s anything on your mind. And that counts for everyone else too :slight_smile
Appreciate the support @BertG
Cheers,
Jan