XFS? JFS? Supported filesystems in RHEL now and future?

[Don MacAskill <redhat onethumb com>]

Since my last quick question was so successful, I think I'll try again.  :)

I have some boxes running SuSE Enterprise 8, which I'm hating, and I'm 
anxious to move to RHEL 3 instead.  However, they have a few terabytes 
in XFS filesystems.

I realize there's no XFS support in RHEL 3 ... does anyone happen to 
know why?  And is it likely to change in the future?

Also, I've played around with the 2.4.21-4.EL kernel, and notice that 
there is JFS support in the kernel, though it doesn't seem to be enabled 
in the shipping binaries.  Is this an officially support fs by RedHat?

Or is ext3 the officially supportd and recommended filesystem for all 
RHEL3 installations?

Thanks!

Don