As announced at http://www.redhat.com/archives/fedora-devel-list/2009-January/msg00071.html, most of the git-* commannds have been moved from the standard $PATH. Use of the git-* form has been deprecated since around 2006 and upstream moved these commands by default with git-1.6.0. Users are encouraged to update their scripts. If changing scripts is not feasible, a workaround is possible: PATH=$(git --exec-path):$PATH
Added to F11 Bugs/Known Issues page.
Since it doesn't look like Docs/Beats has been scrubbed up for F11 yet, I added a note to https://fedoraproject.org/wiki/Fedora_11_Alpha_release_notes. I think we should avoid calling this a bug, as it is quite intentional and in line with upstream's defaults. :)
Thanks Todd, that's the best place to put it right now. We'll migrate content from there to the main release notes later anyway; it will also appear in the Beta release notes page, etc.