Generally, you can modify its template to layout the viewer as preferred. That is one of the unique features in the new viewer (See the ReportViewer\templates folder in the demo project).
If you refer to the report content, the customization mechanism presented in the article Styling and Formatting Reports page (see the Report Globalization section) is still applicable.
Let us know if you have any further questions.
Regards,
Stef
Telerik
Have you tried the new visualization options in Telerik Reporting Q2 2013? You can get them from your account.