Due to the licensing problems it won’t ever be included in the default kernerl package but the FUSE adepted guys are doing the porting work:
UPDATE:
During a deep read of the LinuxWorld article I found a really interesting thing:
Samuel has already found a ZFS bug, and Correia has submitted a fix back upstream. So, the first real users to benefit from this Linux project will be those running Solaris.
power of open source