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Nothing in that output worries me. The messages you are seeing about using an older format are documented at http://docs.oracle.com/cd/E23824_01/html/821-1448/gcikw.html#scrolltoc.
There is one thing to be careful of before upgrading zpool versions: if you have multiple boot environments and the Solaris version installed an older boot environment doesn't support the newer zpool version, that older BE will be unable to read the upgraded zpool. If that upgraded zpool is the root pool (i.e. "rpool" in most cases) you will be unable to boot using the old BE. That is, if you are now running Solaris 11/11 and your zones zpool was created with Solaris 11 Express or earlier, you should only upgrade the zpool version on the zones zpool if you no longer need to access it from Solaris 11 Express.