Downloaded the Lost Planet demo yet? Along with the single-player demo from May, it should give you a pretty firm idea of whether you're going to buy it when it comes out on 12th January.
If the answer's in the affirmative, Capcom suggests pre-ordering from Game, GameStation, HMV, Virgin or GameStop, because if you do you'll also get a special "token card" which unlocks a second multiplayer map called "Dilapidation" to go along with the "Pirate Fortress" level in the basic demo.
And yes, that means that a one-level demo effectively becomes a two-level one, albeit for a small pre-order fee. Up to you really. If it helps make your mind up, why not read our recent first impressions?