Another update part of today's set of fixes for Windows RT (and Windows 8, as well) are driver updates improving performance with Windows, Volume and Power buttons. Among these fixes are one designed to make sure Windows 8-based devices wake from sleep when users press the Windows key or Home Button. (I've had an issue with this on my Surface Pro loaner, which resulted in me having to restart the device every time I wanted to use it.)
Other non-security-specific updates for Windows RT and/or Windows 8 include improvements for Bluetooth audio playback quality and playback when users stream videos from Windows Media Center to Xbox consoles. There's also a fix for issues some users have had around receiving redundant security confirmations after they connect their Microsoft accounts to Windows 8-based devices.
A bunch of new language packs are also part of the set of updates out today, including support for Slovak, Bulgarian, Solvenian, Croatian, Estonian, Serbian (Latin), Serbian (Cyrillic, Serbia), Kazakh and Lithuanian.
In order to check for and proactively install Windows 8/Windows RT updates, Microsoft advises users to follow this check list:
Open PC Settings, by swiping in from right edge (or, if using a mouse, point to upper-right corner of screen)