So. I will be perfectly honest with you. I do not know when the release will be available here on .org and through the automatic update in your site’s dashboard.
The development of 2.0 was finished and the release was tagged September 9th on github. But I do not have access to the theme repository. The ball now lies with Ian Stewart and after that the Theme Review Team.
I have sent him the zip, but he needs to upload it and it needs to go through the queue and get reviewed before appearing in the dashboard. I don’t know the current waiting time for themes. I know the Theme Review Team are doing the best they can in keeping waiting times as short as possible, but they always need more people to help out. It is entirely volunteer based.
I am sorry I cannot give a more satisfactory answer. I have done all I can at this point, but the rest is outside of my control. If you like, you can download the release from github in the meantime:
https://github.com/ThematicTheme/Thematic/releases/tag/2.0