I've got my PC Gamer infront of me right now and there are actually five new LOTR games coming out.
Return of the King - like the PS2 Two Towers
War of the Ring - Think Warcraft 3
LOTR: Battle for Middle-Earth - Think C&C Generals
Middle-Earth Online - Online RPG
The Hobbit - Action/Adventure. Looks like fun cartoon graphics.
There are also many awesome LOTR mods to about any game that just need to be downloaded.