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Use of the ext4migrate option results in unsupported ext4 filesystems.  Product management and GSS have requested that we remove the ability to migrate ext3 filesystems to ext4 in anaconda.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

I tested this with anaconda-13.21.125-1 doing an upgrade from 6.0 with ext3 partitions to 6.2. Upgrade completed, no traceback and fstype not changed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1565.html