I'd be happy to elaborate.
Our group is not so much interested in creating or allowing users to create 'flowcharts' per se, but rather with the spatial representation of data. I think that one of telerik's few weaknesses right now is their over-reliance on controls that provide navigation and organization, and a minor lack of controls that present information in unique ways. Obviously the gridview is a major one, and RadChart exists for certain types of data, but there are many interesting ways to present data that are not covered. This one is a bit futuristic, but I'm sure Telerik could do it really well.
In our case, as I said, we're trying to display complex data hierarchies in a spatial representation. The data is coming from a non-relational system, and in its native environment exists much like a network of complex tree structures. As such, the tree layouts of these products are very valuable. The one twist is that the links between data in this database can violate some tree conventions, such as only one parent per node, etc. As such, some of the more advanced layouts are needed, and now performance enters into it. I have tried the top products available, and although their performance is quite good, it is likely helped by the limited graphics capabilities, which in our case, do not matter much, so we are somewhat satisfied. We are typically presenting anywhere from 10 to 1000 nodes, with as many links between them.
If Telerik attempts to create such a product, I have a few suggestions. First, design with performance in mind, and allow the client to scale back the features [especially graphics ones] to achieve maximum performance if needed. Second, most layout algorithms are in the public domain, so incorporate a bunch of them from the outset to satisfy as many needs as possible. I really like MindFusion's Simulated Annealing algorithm and AddFlow's Hierarchical Layout, but I'm sure both of these are based on published algorithms. Also, since this control is really just a single view with self-contained nodes, links and images, it shouldn't require much integration with other components, and the first version should be somewhat self contained, with additional capabilities perhaps added over time, with measured cost against the performance, etc. Finally, make sure to handle simple events like right-click context menus and other basics, without forgetting any. Both of these other companies did!
With regards to WPF, I'm unfortunately not very learned on WPF. Can you explain how these two technologies can be used together? Can I incorporate WPF controls into winForms and vice-versa? Are there any products that Telerik has for WPF that are not found in winForms?