• UPDATE: It sounds like it is indeed the second case [LINK]
  

  Currently making a water object you can swim in! It's possible with logic! People will be so happy! #LBP3JAM

  This means that it'll take a little more effort to create, and might not have the nice splash/ripple effects, but you'll be able to "swim" through any material you like. Maybe even objects.
  
  
• The Interactive Live Stream Sensor lets people who are watching someone streaming in a level affect what happens. Since it's just a sensor, whatever happens is fully tweakable by the creator. [LINK]
  

  Can't play with this yet ofc, but oh the possibilities.... #LBP3JAM interactive livestream sensor
  

• There is a new animation-based tool called the Character Rotation Tweaker, apparently allowing for top-down gameplay without the use of controllinators [LINK]
  

  And err, you wanted a top down sackbot / sackboy, right? #lbp3jam
  

• Decoration Mounts (briefly mentioned during the Gamescom create mode demo) allow you to tweak decorations through various sizes/shapes/animations [LINK]
  

  Decoration mounts are now in the game, in a variety of shapes and animation types, stretch rotate etc! #lbp3jam
  

• You can make and track "quests" using a new tool/feature called the Organisertron [LINK]
  

  

• There is a new Object Saver tool that will save the state of a specific object when you leave a level, keeping it exactly the same for when you return.
  
  

  Object saver saves the state of an object when you leave, like memorised item on your return to the level #LBP3JAM
  

• You can easily set materials to be Dynamic or Static (physics/no physics) This is a returning feature from LBP Karting and LBP Vita [LINK]
  

  Anyone see this one yet? Static / dynamic coming to a ps4 near you :)
  

• There are several new tweakers, including an Opacity tweaker and a "Shardinator"
  

  Tweakers, tweakers everywhere... Gravity, opacity, material, physics, attractor, destroyer, shardinator #lbp3jam
  

• There are tons of new "Effects"-type decorations, such as water, smoke or fire.
  
  

  Bags of effects to play with, opaque, transparent, all colours! Beautiful! Water, smoke, fire, etc #LBP3JAM
  
  Can't do these justice without animation, but here's some effects #lbp3jam
  

• There are new 3d shapes under objects that can be merged and recolored to give the player some ability to make their own custom-built objects.
  

  #lbp3jam goodies bag now includes 3d shapes to make your own custom objects. All recolourable and mergeable!
  

• Decorations have a similar group of recolorable basic shapes
  
  

  Recolour able decorations, all shapes you can imagine :) #LBP3JAM
  

• There are a plethora of new materials, including a Fog Material
  
  

  #LBP3JAM DAT SASSY FOG MATERIAL ^-^ #Ohmy!
  

• There is a new tool under logic called a Wave Generator. Not sure what it does, but it's there!
  
  

  

• There is another new logic tool called the Broadcast Microchip, allowing you to make logic once and send it wherever else you'd like throughout your level.
  
  

  New broadcast microchip. Make logic once and send it anywhere in your level :) #LBP3Jam
  

• There's an Advanced In/Out Mover allowing for smoother movement of objects between layers. The exact nature of how this works is unknown at the moment, but it sounds like it will open up a great number of options for 3D platforming gameplay.
  

  Advanced in out mover lets materials glide smoothly through layers - and I LOVE IT
  

• Looks like a metric ton (or should I say tonne?) of new content. Here's a look at some new foliage decorations, a section which is more than double the size it was in LBP2 even with all of the add-ons. Also note that everything marked with a color-wheel can be recolored.
  
  

  

• There's a new race-gate specifically for top-down levels
  
  

  

• Lights appear to have been moved from the Goodies Back to the Tools Bag, and there look to be quite a few new types, including what looks like a Plasma Globe!
  
  

  

• The Sackpocket (a feature that is supposed to let Sackboy store and switch between multiple gadgets such as the grappling hook and creatinator) looks like this
  
  

  

• The Gamescom demo showed off an Animation Tweaker, but we didn't get to see what it's options looked like. Here's a screen of that.
  
  

  

I'll be updating this as the new info comes in. If any of you find something that isn't in the OP, post it and I'll add it in!

You can catch up on other LBP3 info Here or Here OR for the most comprehensive list (and probably the best written one as well) you can check out this thread on LBP Central


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Extra Stuff
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Some footage of a game-jam level in progress. 9 hours in.

Footage of someone else's level. Crab-killing snowman in a 3d environment. 12 or so hours in.

http://www.neogaf.com/forum/showthread.php?p=129861251#top

Banana nunchucks:

https://mtc.cdn.vine.co/r/videos/1FA5AA54481122926700968243200_1994dcfca79.3.4.mp4?versionId=toyLOI7t2KgT26jspuRCpcc.JWIGY3sl

Character creation:

My eyes! They pain!

Thanks for all the info; LBP3 is one of my most wanted Game of 2014 !
Can't wait to create something and let you try :)

edited : I have one question, about the 16 layers, about the transition between layers : it's gonna work like a true 3D ? Or just smoother than LBP2 ?

I mean, walking up/down through layers.

There's an additonal mover called the 'advanced mover'. This allows smooth transitions through the 16 layers and you can apply it to your sackboy :)

The snowman looks like it's just using the 16 layers and moving smoothly between them, but a dev has said isometric levels will be much easier now, so I'm assuming we can make sackboy walk up walls and tilt the camera right down which effectively gives us isometric levels with 16 layer height and of 'infinite size' because of the new thermo setting.

If you look at that giant cat creature, it says 'mover mods off' at the bottom! That has me intrigued.

That's marvelous !!!  And gives you so much more freedom and possibilities.  You might opt now for a credible 3D world, 16 layers up/down with

advanced mover through the entire level(left-right).  Can't wait.

PS: and yep, I noticed the 'mover mods off' at the bottom:  

you must have the choice between the 'Standard LPB 'layers transition'' to create similars Levels to LBP2, and the 'advanced mover', which allows you to create a new Gameplay style, more 3D, like a Crash Bandicoot Game :)

With clever use of the 'emitter' you should be able to create a decent isometric level anyway, but I've still got a feeling that we'll be able to tilt that camera much lower and make sackboy walk up walls.

can't wait to see more.

The power of the PS4!

Nice! Can't wait to see the final product