The previous games allowed three-way battles, and so does this one. They were a lot of fun in multiplayer. I'm still kind of wondering if they're going to use the Alien life cycle in MP, like they did with AvP2. Finding out someone molted into a queen, well, I'd run.

The singleplayer will also feature all three factions in their own campaign, so it'll only be the marine campaign that's really creepy. The lab/base setting my be old, but if it's pulled off well, I'm ok with that.
Minimum Requirements:
Windows 7/ XP/Vista
1 GB System RAM (XP)/ 2 GB System RAM (Vista)
3.2 GHz Intel Pentium 4/Athlon 64 3000+ or equivalent processor
DirectX 9.0c compliant video card with 128 MB RAM (NVIDIA 6600 or better, ATI X1600 or better)
Recommended Requirements:
Windows 7/ XP/Vista
Intel Core 2 Duo E6400 or equivalent processor
2 GB System RAM
DirectX 9.0c compliant video card with 512 MB RAM (NVIDIA 8800 series, ATI HD2900 PRO or better)
My computer's two years old, and is just below (darn CPU!) recommended spec. If you've bought even a decent midrange PC within the last year (or a pretty high end one within around 2 years), give or take a few months, you should at least find it playable. Btw, I'm getting much of my info from aliensvspredator.net, if anyone's wondering where I'm getting this.
Getting facehugged was cool? I hated those things! I used to have such a hard time seeing them, and I'd nearly fall out of my chair when they latched onto me. Xenomorphs give me nightmares. I can still hear the scratching noises they made! *shudder*
I've wanted Colonial Marines to get out sooner as well, but I believe they actually pushed the release back for AvP. In this case, I didn't find out about Colonial Marines until a month or so before stumbling into some E3 footage of AvP, so I really don't mind. Either way, I'll be happy with this year, and possibly a much of the next.