email from Ric Wheeler:
I am trying to do one more pass over the guide.
A few notes below, thanks!
ext4 is the only fully new file system in 6.0.
GFS2 and XFS are both in RHEL5 already (as fully supported).
File system encryption (ecryptfs) is still a tech preview item in 6.0, the footnote is nice, but I would add a clear notice that it is tech preview.
File system caching is also tech preview.
I would add some encouraging words to have users always default to creating new file systems (not migrating). Something like:
Red Hat always recommends backing up all file systems before trying to convert. Also, it is highly recommended to create new file systems where possible instead of converting in place.
I would add a similar note to 7.2 - we really want people to make new file systems, not convert, when possible.