Adobe Reader 8.1.2 is out, download here.
There are not any new security advisories for Adobe Reader at this time. Until I hear otherwise, this may just be a bugfix release.
Update:The 8.1.2 release notes are available. The summary states “The Adobe Reader 8.1.2 update addresses a number of customer workflow issues and security vulnerabilities while providing more stability.”
Update 2 Symantec Deepsight reports that a proof-of-concept exploit is available to members of the Immunity Partners Program.