Add support for Web Sockets to enable push notifications to grid, listview, and other data bound widgets.

Right aligned columns are common for number fields and it would be nice to simply set a property in HTML and/or the view-model:
E.g { "field": "amount", "align": "right", "title": "Amount", "width": "110" }

In the datasource can you give us a property which will tell the DS that it needs to stringify the parameters so I don't have to keep googling this syntax?
parameterMap: function (options) {
                return kendo.stringify(options); // kendo.stringify serializes to JSON string
            }

So just like read: { stringifyParams:true ...}

Add a visible property to the column items for the grid control. Then provide the value in the view-model. This would allow us to declare the columns in html and manage their visibility in the business logic.

If possible, please consider making the Kendo DataSource compatible with the data returned from using an ASP.NET MVC 4 Web API project possibly by adding a 'webapi' dataType.

Visual Studio plugin to generate javascript proxy classes for communicating with web services. 

Normally in ASP.Net the .Net proxy classes would be generated for me, but since I am now moving towards building RIA applications most of the WS calls now take place client side. The process of manually setting up service calls is a bit cumbersome so if KendoUI could include a tool for this it would be great.

Option to refresh one item from a datasource from the server using a GET request using the transport read url appended with the item ID field value.

See: http://www.kendoui.com//forums/framework/data-source/how-to-refresh-an-item-in-a-datasource-with-server-data.aspx

can you advise if the upcoming mvvm framework can be replaced by knockoutjs and / or work with it. we have invested heavily in ko and love it as an mvvm framework. we have also started to use kendo to replace telerik mvc (where appropriate) but would like to know if we can ensure that all 3 products will work together... telerik for server-side UI, ko and kendo for client.

Excellent work, I think (one/two way) form data binding with JSON/XML serialization will be very helpful. Templates are good but need to support attribute based data binding expressions without templates.

Like many other Kendo components, the treeview is not mature enough to be considered to display dynamic hierarchical data in a LOB application (features limit its use to a static web site).

I can only recommend to urgently add databinding to a datasource. Then you will have to consider loading the dataSource on demand. See http://demos.telerik.com/aspnet-mvc/treeview/ajaxloading

Add support for automatic polling/refresh on DataSource.
Property: interval in milliseconds

It'd be terrific if there was built-in access to client-side data stores (e.g. IndexedDb).

Will you be doing something like KnockoutJS?