WordPress 3.3.1 is available from January 3rd, 2012. Version 3.3.1 is a security update and fixed 15 bugs. While I didn’t meet any bugs in version 3.3 myself (and you?) I have updated my blogs as soon I got message about this security update (it fixes a cross-site scripting vulnerability that affected version 3.3) available. The same thing is highly recommended for other WordPress blog owners.
Do not wait when hackers exploit existing vulnerability, update your WordPress installation today, do not allow bad guys to use old and already closed black doors to your sweet WordPress blog home.
For more information, see the oficial release notes.