IBM has just released a fixpack for DB2 v10.1 which provides Solaris 11 support. Per the IBM DB2 support statement for Solaris:
Support for Oracle Solaris 11.1 was added as of DB2 v10.1 fixpack 4, released May 23rd, 2014. The DB2 v10.1 Information Centre does not yet reflect this change. Plans for DB2 v10.5 will be announced at a later date.
DB2 on Solaris 11 is supported on SPARC only. At this time there are no announced plans to support Solaris 11 for x64 platforms, or versions of DB2 prior to v10.1.
This fixpack is now available for Solaris users via all supported distribution channels from IBM.