This isn't the entire video but it's the creations the developers came up with when given a period of time to do whatever they wanted..
http://www.youtube.com/watch?v=8SE5owAIPmk
By now some of these have been implemented or are about to be with Dawnguard.
List:
Flow based water - Not in
Spears - Not in
Kill cams for magic - Implemented
Kill cams for archery - Implemented
Paralysis Runes - Not in
Hanging structures and moving platforms - Not in
Dungeons built around water currents - Not in
Dark Dungeons - Not in
Advanced follower commands - Not in
Adoption - Not in
Build your own home - Not in
Spell combinations - Not in
Waygates - Not in
New mounts - Coming in Dawnguard
Goblins - Not in
High level Draugr - Not in
Mounted Combat - Implemented
Dragon mounts - Not in
Familiars - Not in
Kinect Shout activation - Implemented
Improved underwater visuals - Implemented
Snow Footprints - Not in
Not rigid objects (leading to weapons like the flail and tree motion) - Not in
Special Arrows - Not in
Werebear - Not in
Werewolf Perk Tree - Coming in Dawnguard
Vampire standing feeding - Coming in Dawnguard
Vampire Lord - Coming in Dawnguard
Giant Mudcrab - Not in
Perhaps there are more of these coming in Dawnguard than have been revealed. Obviously they are/would be a lot more polished than displayed in the video.
Personally I would like the dark dungeons where a torch, spell or night vision would be necessary.
