I don't think the issue here is about security, it's mainly keeping "junk" out of the template that doesn't give anything to the end-user experience.Conversely, removing the version number from the footer gains you nothing in terms of security, although it does give you a small amount of obscurity. Personally, I don't care if the version number is there or not.
I pretty much agree. In the Admin CP, show the version of XenForo currently installed, and that's it.
Considering it's not visible here, I don't think we'll see it on the footer. In fact I don't think it even appears in the source anywhere.
Why do a lot of forum software put the version number in the footer? It means next to nothing to users in general, and doing it because "it's normal" isn't a good enough reason. The only place the version number should appear is in the admin control panel.
It would be a nice change if the version number didn't appear in the footer.