WordPress 4.2.3 was released today as an important security patch. There will not be any visual changes in this update (as with all other incremental WordPress updates), but it is extremely important to update to secure your site.
Specifically, the update addresses:
a cross-site scripting vulnerability, which could allow users with the Contributor or Author role to compromise a site.
Read more about it here.
All wpONcall members are already updated. Have you updated yet?