A:Answer 920-008617 vs 920-009017, I have same question. I thought 009017 should be newer model. (latest model with different case, check logitech.com)
But it's very confuse.
Bestbuy.com shows different photos for different models in the website. I just went to BB store, over there when I opened box of 920-009017, its case looks like 920-008617 in the picture. I am not sure if the product in that 920-009017 box is really newer model. I think the keyboard function should be similar.