With gears of war three the cog has been dispended and a new threat has emerged the lambent as well as the locust. The new lambent are tougher then the locust sprouting huge tentacles out of the earth and for hideous mutant creatures to pop out, the locust also are no pushovers with new enemy types such as a bomber wielding a weapons which send a burrowing grenade thing towards you making cover redundant. But you have some cool new stuff as well the first being the pendulum lancer which is a lancer but without the chainsaw and rapid fire this conserves more ammo and makes it more accurate and instead of a chainsaw you just have a bayonet. Among with that you have these huge walking mek robots which can take on a berserker. Epic have also added in some new features into gears 3 such as weapons swaps with your Ai companions including new graphics not showing just a 2D background. The multiplayer in gears 2 was good and with gears 3 many new modes have been added the most talked about called beast which is similar to horde mode but you can play as a locust, be a little ticker and suicide bomb unsuspecting players or be a huge berserker and battle a cog mek robot, and for the first time gears 3 will have a beta which you can access mainly by buying the bulletstorm epic addition and there will be plenty of other ways of getting into the beta when it launches check the gears of war news page for further updates.
http://gearsofwar.xbox.com/default.htm