Fourth Age - Total War is out and downloadable now, along with a Corsair Invasion Expansion Pack.

Lord of the Rings - Total War is out as a Beta (with just custom battles), but some fans have added the Middle Earth - Total War map to create a campaign (note: this is non-official)

Middle Earth - Total War There is a downloadable release on the LotR TW site, I'm not sure if work is continuing...

Links

Lord of the Rings - Total War - www.lotrtw.com
Lord of the Rings - Total War Forum - www.lotr-tw.net

Hope this helps,
ByzantineKnight