tried with a demo here, seems that in the cancel event if's only possible to get the edited value instead of the original values. E.g. in the following example, if you edit the product name "Chai" to "foo", after click on the cancel button, i'd like to have the "Chai" back in the e.model.ProductName, but it's not, it's the value "foo".
here is a "Kendo UI Dojo
" code sample.