I also hope that rooting or later a LineageOS will be available. I bought my one from Amazon in Germany 64GB/4GB/WiFi and it has following build number TB-8704F_S000024_170706_ROW. I came from Nexus 7 (2012).
The link in the first post still show to the Slim6 builds. This one bring you directly to the Slim7 build.
I give it a try