I'm not sure if a treeview component is planned for R1 2018 but a treeview react component would be very useful.
The TreeView component is already available in the Kendo React suite. For more details, please check this link: https://www.telerik.com/kendo-react-ui/components/treeview/
Regards,
Petar
Progress Telerik
A TreeView component is certainly in our plans for future versions of the new React components, but will be after R2 2018. In the meantime you can use our wrapped component in your React applications: https://www.telerik.com/kendo-vue-ui/components/treeview/