Lord of the Rings: Battle for Middle-earth Game Demo to Release on Internet February 9th
You'll be able to download it on this page at Gamespot.com. Here's a brief bit about the game (from Gamespot.com):
Get your first look at this highly anticipated RTS sequel, and unlock the world of Middle-earth as it was meant to be! With a wealth of content taken from Tolkien's original fantasy novels, you can now experience unseen lands and mythical campaigns that go beyond the famous motion pictures.
The demo features a tutorial and single-player skirmish mode with two maps. You'll be able to choose from two of the games' three new factions: Goblins and Dwarves.