First I'd like to apologize for how cluttered this post is. The demo came out today and I took a couple goes at it. It's the same demo from E3 and lets you play through a small portion of the three campaigns. Thankfully if you're playing solo you can choose which character you want to play as before you start. Unfortunately each demo portion only really features 1-2 enemy types. It also kicks you back to the main menu if you die, which makes the Leon/Helena portion of the demo incredibly tedious if you're looking to get to the ryona. Attempts to die aren't helped by the fact that your AI partner is constantly shooting everything. You can't manage their inventory and take their weapon away in the demo so you just have to hope that they're occupied with something else when you're grabbed. The demo supports online coop so if you want to try with a friend you could do that. Anyways here's what I've found so far.
Leon/Helena - This portion of the demo is incredibly slow and the zombies only appear at the very end of it. When you first encounter a zombie it will lead into a quick time event. The zombie will knock Helena over and jump on top of her. If you don't struggle fast enough it will bite into Helena's neck and kill her. You can't really see the initial bite since the zombie blocks most of your view. Now what really impressed me was how they handled the death scene with the zombies you fight normally.
Grab 1: Zombie grabs Helena by the arm then bites her in the neck. Pretty standard
Grab 2: Zombie grabs both of Helena's arms then bites into her forearm.
Death: Zombie pushes Helena down to the ground. It then bites her in the neck and starts tearing into her stomach with its hands, pulling out her entrails and feasting on them. The zombie then looks back over its shoulder at the camera, reminiscent of the first zombie you encounter in Resident Evil 1.
Chris/Piers - Obviously won't matter to most people. Still I tried to see some of the grabs here in case the enemies carried over to the other campaigns in the full game. In this part of the demo you'll be fighting the J'avo, a bunch of human-like enemies that use weapons. If you shoot certain body parts they'll mutate. So if you shoot their legs they'll sprout wings or if you shoot their arms they'll grow long, scythe/crab like appendages. These are the only two mutations I've seen so far in the demo. There are also some J'avo who wield machetes that can grab you.
Grab 1: Flying J'avo's have their legs replaced with a winged creature, their upper torso hangs upside down from the bottom of it. The upper torso can grab you and if you don't struggle you die. Simple as that. You just drop dead. No special animation as far as I can tell.
Grab 2: Machete J'avo. They like to grab you from behind. What they do afterwards is unknown to me. The AI just loves to ruin it by breaking you free.
Jake/Sherry - You'll be fighting a large humanoid with a mechanical arm called the Ustanak. There are also a few weaker J'avo in this portion of the demo. However, unlike Chris and Piers' scenario the J'avo here don't mutate. That leaves the Ustanak as the main death dealer in this scenario.
Grab 1: This becomes available immediately once you start this section. During this short sequence you have to run from the Ustanak. Assuming you're playing as Sherry If you don't outrun it it will grab her with its mechanical arm and quickly squeeze/crush her to death.
Grab 2: When you fight the Ustanak in the second half of the demo he'll try to grab you again with his mechanical arm. If he manages to grab you four needle-like appendages will come out of his arm and stab into the front, back, and sides of Sherry. If you die at this point Sherry will simply slump over in its grasp.
I should add that, as is typical with most Resident Evil games, the screams/death moans in the game are superb.
There might be more deaths/grabs but I don't really have the patience to repeat the introductory parts of these levels every time I die.