There are rumors that another industrial control system advisory has been released to the US-CERT Secure Portal by the DHS ICS-CERT. Typically these advisories are for high-risk vulnerabilities for control systems used in critical infrastructure. They are released in limited distribution to allow critical infrastructure owners to take appropriate mitigation measures before the vulnerabilities are made public.
Again, I do not have access to the Secure Portal (if I did I would not be able to write posts like this), so I am not able to confirm the veracity of these rumors. Control system owners and ICS security vendors can get access by contacting ICS-CERT (see the bottom of their web page for instructions) and determine if any of the control system applications that they are using have active advisories listed on the Secure Portal.