All Pressjitsu customers have been automatically upgraded to WordPress 4.2.2. There are no major changes in this release so we do not anticipate any breakage. However, if you do see anything strange and you think it’s related to this change, please contact us immediately.
If you’re not hosted with Pressjitsu, your WordPress install should update itself automatically within 24 hours, provided that your server configuration supports that. We encourage you not to wait, but update immediately. The security fixes in this release have been ported back up to WordPress version 3.7.13.