Unfortunately the SCM functionality in 4.0 is fairly limited. You can commit, switch branches, branch/merge, diff previous versions, update to HEAD, but you can't revert.
We all expect this to get better in successive updates but it does seem like a rather silly omission. The Time-Machine-like diff version picker seems the perfect place to put the UI, so I'd expect it to appear there when it's finally supported.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…