We aren't seeing the new Theme panel for modern sites, our tenant is on First Release so I'm expecting it should be available at this point. I can add a custom theme using the Theme Generator and Powershell, but I can't get the new "Change the Look" menu to open, it always navigates to the classic theme portal.
We're seeing some odd behaviour with Themes in our Sharepoint Online tenant, we are working to update all our default landing pages to the Modern Pages so that our users have a consistent experience throughout Sharepoint, but at the moment the Modern pages dont seem to be fully honoring the classic themes (Orange accent colors are appearing in modern pages that arent a part of the classic theme, and that dont appear in classic views).
I'm assuming that if we could access the Modern theme panel we could resolve this. Do we just need to wait before our tenant is provisioned with the capability? or have i missed some switch somewhere that will activate it?