Microsoft is to release non security updates monthly instead of Patch Tuesday. This for both Windows 7 SP1 and 8.1:
To obtain these updates one has to visit Microsoft Update Catalog which means you'll need to use IE although later in the year this is being changed so all browsers can be used...
Microsoft have released Update 1 for Windows 8.1:
Improvements
This update includes the following new features and improvements:
Enables a more familiar mouse and keyboard functionality for modern apps and controls.
Improves the web application compatibility of the Internet Explorer 8...
compatibility
cumulative update
device management
enterprise mode
error fix
hardware support
internet explorer
known issues
microsoft
mobile management
multi-display
performance
prerequisites
reliability
security
servicingstack
update
usability improvements
windows 8.1
windows server