Are you talking about Aliens vs. Predator (2010) ?
I've played the original and it's awesome, but the new one has better graphics but is way shorter storyline and feels like something is missing from the gameplay. It's more a multiplayer fun game rather than singleplayer like the original. Also uses Steam Client and it's a huge size game like two double layered DVDs for all the cool graphics and video.
or are you actually talking about AVP3 - Aliens: Colonial Marines, which I don't think has a release date yet? Looks very interesting thou. I've loved the previous old games in the series.