I set up Trac 1.0, added the entry tracopt.versioncontrol.git.* = enabled to [components] and used the Admin panel to add my repository. While branches show up in the timeline, the source browser does not provide means to browse a different branch, tag or revision like e.g. here (that site uses Trac 0.12 with the GitPlugin, which has been included into 1.0). Is there a setting I missed or does the 1.0 git integration lack this feature? The ?rev=... parameter is simply ignored when entered manually.
It should work, but slightly different than the GitPlugin. They allow all kinds of repositories at the top level now. So you need to click on the top-level repo name, and then you'll see the "Visit" dropdown box appear near the top of the page. That will allow you to select a specific branch or tag.
You can see this in Trac's own repository. The browser takes you too the top-level, and shows a series of repositories. Now click on one. For example, cboos.git. You should see the "Visit" dropdown and be able to pick a branch.