Now, you will have improved control over parameter formatting and placement.  Since the inception of Reporting Services about twelve years ago, parameters have always been arbitrarily arranged in a narrow bar at the top of the browser window, from left-to-right, and then top-down.  Now the report designer has a grid to manage the placement of parameters,  in the parameter bar, in any configuration, within definable rows and columns.

The new parameter bar applies SSRS deployments in Native mode but does not change the way parameters are rendered in SharePoint integrated mode.