I believe they planned to extend beyond then, but for Public Sector only - given the sheer number of 11.5.10 implementations out there and the evident lack of funds available to upgrade. I can't find the details of that, though.
Hi Guys, support for 11.5.10 is extended to 2013. Got the info from metalink from the following document ORACLE INFORMATION-DRIVEN SUPPORT - Oracle Lifetime Support Policy. I think the doc ID is 1195034.1