This is set for tech preview status in RHEL6.0.
Verified in 2.6.32-33 that feature is present and passes basic sanity checks(read, write, mount/umount, different cipher types).
Red Hat Enterprise Linux Beta 2 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.