Let developers of MVC Extensions apps vote on their favorite themes to be upgraded from "legacy" status to officially supported status for Kendo UI Web:  I vote for Vista theme

All the themes has Mobile support except the kendo.bootstrap-v4, we need the mobile support for new bootstrap v4.

current bootstrap 4 css : https://kendo.cdn.telerik.com/2017.3.1026/styles/kendo.bootstrap-v4.min.css

Expected Mobile Support css : https://kendo.cdn.telerik.com/2017.3.1026/styles/kendo.bootstrap-v4.mobile.min.css

For now 2 css are used (kendo.common.css and kendo.theme_name.css) for whatever widgets are present on the page. Would be nice to have styles for different widgets separated into single css files (as it is in jQueryUI), so that, if I need only a DropDownList on the page, I include something line "kendo.core.css" and "kendo.dropdown.css" and the whole css framework would not be downloaded each time.

Since there will be a theme for Microsoft SharePoint 2013/Office365 it would be nice if there would be a theme for Microsoft Dynamics CRM 2015. This would be really helpful.

All of your templates use the exact same sprites.   Your themes just change the colors, which we can do from the themebuilder.   I think it would be more beneficial to have some different 'looks'.   For example, you have the 'Legacy' MVC themes available.  Not only do they use a different set of sprites, but they look different and there are like 13 of them.  

As Kendo UI is now, there are 5 themes and they are all pretty much the same, with different colors.

Please provide other options.  Please make the MVC 'Legacy' themes part of the standard Kendo themes.  Please provide different icon sets.

Maybe we could even pick a theme and pick an icon set or a look, etc.

add a new theme/style according  Atlassian User interface guidelines see: https://docs.atlassian.com/aui/latest/docs/inline-dialog.html would allow to integrate kendoui elements in all Atlasssian Products 

In the new SASS Default v2 theme, you took away too much contrast compared to the original default theme.  Why?  Don't you know that many people find it hard to read things where the text color is too close in value to the color of the background color??  Please stop with the very low contrast.

Kendo UI jQuery does already have Metro themes. Pls add this for new Kendo UI, too!

Kendo provides a means to build your theme with SCSS variables in the build process. It would be great if it were possible to have these variables scoped to specific contexts, eg <div class="panel-dark"> receives the panel-dark themes, whereas if it is a child of "panel-light" then it receives the panel-light themes. Some of these kinds of features may be on the way with upcoming Custom Element features eg :part, :theme, but could potentially be possible today by having a style transclusion component, something like <kendo-theme-adjuster [styleCallback]="scssVariableSetter()"><my-content></my-content></kendo-theme-adjuster>. We need to support a variety of component themes simultaneously (not just switch back and forth) within a single app, and would like to not need to manually override all the kendo styles in these situations.