I'm up to Act 3 in co-op campaign. It's Gears alright! Normal seems a little more easier than I remember. The new weapons fit the story, and there's quite a few new weapons. The Sawed-Shotgun in my new best friend. Just remember it's really a melee weapon and you're set. Diggers fire rockets that go undercover, then pops up like a bouncing Betty when it reaches a target. They're slow, so it's really easy to dodge. Retro Lancers have bayonets instead of chainsaws, but you can insta-kill with them, and you can charge with them. Though they are less accurate than the normal lancers, but deal more damage. I like the hammerburst myself. You can only riflebutt with it, but you can aim down the iron-sights, making it a great carbine. I hope I get the gold version this week! The longshot has a bubble effect with the scope now, so it'll take some shots to get used to the new scope. Single use weapons went up a lot in this. You can pick up cleavers now, and there is a new weapon called the "one-shot". Super powerful sniper weapon that will insta-gib anything that's hit by it. But, it draws a line directly back to your position just by aiming it.
Oh, check out the info on Horde Mode, because they changed it quite a bit. Still looks like a blast, but there's a money mechanic now where you spend money on ammo drops, barricades, turrets and the like. And hopefully we'll be able to check out beast mode too.