In previous versions of Lightroom, selecting one of the tools in the Development Module, such as the Adjustment Brush, automatically displayed the settings panel directly below the tools, in what appears to be a dropdown.
Selecting a tool in LR4, on Windows 7, no longer makes the panel automatically visible, no matter where you are scrolled in the Develop panel; you have to scroll back up to the top of the panel in order to see the settings.
Not critical, but certainly annoying behavior. I looked for other reports of this but found nothing, so I apologize if this has already been addressed.