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What will the default file system be in FreeBSD 9?
It's still UFS. The installer (bsdinstall as of 9.0) cannot install to a ZFS filesystem.
If you want ZFS for your root filesystem you need to do a fully manual install.
PC-BSD installer can install FreeBSD on ZFS. As soon as the installation start, you may choose you want to install FreeBSD (instead of PC-BSD) and then the installer lets you partition your disk using ZFS.