Can't import v15 zpool
I created a version 15 mirrored/compressed zpool in Solaris 11 Express, put a bunch of data on it, and then attempted to "import -f" it into OpenIndiana (both 148, and 148 + pkg image-update). I just got "Cannot import <poolname>: invalid vdev configuration." Just to be sure the pool isn't actually corrupt, I rebooted into S11X and the pool import command worked just fine. Note that I did fail to ever export the pool.
I am currently using zfs send/recv in S11X to transfer the data into my OpenIndiana pool. When that is finished I will try to get you a version 15 file created with S11X, unless you tell me otherwise, as follows:
mkfile 150m /tmp/s11x_zpoolv15.dat ; zpool create s11xpool -o version=15 /tmp/s11x_zpoolv15.dat zpool export s11xpool ; gzip /tmp/s11x_zpoolv15.dat