"As you may know this started as a Google Summer of Code project
and I'm quite happy with the way things have turned out. Since we
are in feature freeze I would like to present the features that
will be in the Vi input mode for the Kate part in KDE 4.2.
"The Vi input mode can be used as the default editing mode by
selecting it in Settings → Configure Kate… →
Editing → Vi Input Mode and/or toggled any time by selecting
View → Vi Input Mode. Nifty, eh?"