The most important part of using Vue especially in Mobile, is it's small size and performance. Unfortunately, Kendo UI's Vue components are wrappers around jQuery which is something we are trying to avoid in our  ongoing developments.
I'd like to suggest building NEW Vue components in full native format with no despondency on other none related frameworks.

Thanks!
..Ben

It would be nice to have a built in PDF viewer control in the Kendo UI and Kendo UI Mobile. Especially Mobile so we do not have to search the net for decent controls that may or may not work for the different devices.

A heatmap (grid-style at least) is very much useful in any decent project management application. A widget that could remotely connect color-shades to jSON data would be really great.

Topojson is a much more compact data format for spatial data. Supporting it would allow more complex spatial data to be loaded without slowing down the browser experience.

Kendo pivotgrid currently has only row and column filters. Filters and Filter area are also important. See other pivotgrid implementations - especially DevExpress ASPxPivotgrid and Excel pivot table