I went today to the Kudamm apple store, and I was only offered a battery replacement in 2-3 weeks they told. I also asked for the complete replacement, they told it was only a short-time offer and also not public, and that they discontinued it right after it came to light.
I was reluctant to leave my notebook there and wait 2-3 weeks, so I told them to take the order and let me know when there is a battery and case. What they also told me that only the battery and the case would be replaced, so the motherboard/memory/ssd whatever would stay the same, no replacement.
I didn't want to push my luck, so I brought my notebook back. Now I'm waiting for the information on when I can bring my notebook in for repair. I hope they won't get any replacement parts and continue the exchanging. My case is also not a simple one as my keyboard layout is american, despite living in Germany, and I also had the maxed-out version of the mid-2012, which was a custom build at that time.