I would love to see a variety of customizable armor in the game. Like add unique features like glass spikes to glass armor (bring back pants!!) or maybe cooler enchantment effects for really powerful weapons like a sword thats literally on-fire (flaming maces sound REALLLY cool!!!). Also I would love to see dragonbone weapons in-game. Bringing back famous daedric weapons like Scourge or the daedric crescent would be really cool to see!! I would also like to see the return of the acrobatics skill. It would be cool to be able to have more mobility options on my character rather than just a sneak roll. Maybe something like like Jumping attacks or jumping off somewhere and land on the person below you (sneak attack kill). Having a more variety of clothing is a must. I didn't like sticking with the arch-mages robes all the time. I pictured him always wearing something more gothic and dark like a arch-necromancers robes.
Introduce darker aspects of magic would also be insanely cool! Bring in Shadow magic like black fireballs or blue flame spells or maybe summon black wraiths and the shadows themselves!! (add a unique flavor of ideas rather than the way things look on earth today). Add some combative conjuration spells like summon giant rocks and watch them slam against your enemy or make magical grass grow for a unique health regeneration or summon giant TREE CREATURES OMG that sounds so cool!!. Cool vampiric sneak attacks like vampiric feeding sneak attacks (bite the neck, drain him dry, and toss him 20 feet away would be cool!). Make dagger dual-wield power attacks faster would be cool because I insanely love daggers (as im sure many other people do also).
Bring in unique editing options like body-tattoos and unique hair styles you wouldnt use when you start out. Also add unique armor options like have the option for your character to wear his helmet while not literally showing he's wearing it. But most of all what I would love to see is a Co-op mode for Skyrim. I still would love to play with my best friend who also plays Skyrim. We would be hooked to the game for DAYS!!! Also bringing in guilds to where you can join the evil side or good side would also be great!!
Also I took the liberty of reposting my ideas for new weapons for your convenient use!!

- Claw weapons (like wolverine-style weapons)
- Spears
- pikes
- polearms
- throwing knives and darts (would be great for slow-motion kill cam)
- throwing spears
- slings (maybe explosive bullets?
- two-bladed swords, axes, and maces ( you hold the hilt of the weapon in the middle and you have a blade, axe or mace on both ends of the hilt)
- flails (spiked maces except the end of it is guarded by a chain so as to swing in an arc formation)
- triple-ball flails
- spiked chains and whips - grenades (to add to alchemy, like poison bombs and smoke grenades for disorienting)
- One-handed crossbows (also called hand crossbows but good for dual-wielding)
- light crossbow (for fast shooting)
- heavy crossbow ( for slow shooting but high dmg)
- Spiked armor and shields (for tackling with sprint)
- hidden glove-blades (like assassins creed style but for sneak attack kills)
- Short swords
- blow darts
- dual-wield two-handed weapons (slow attack and high stam cost but very high dmg)
- flintlock pistols and guns
- scimitar
- rapier
- throwing axes
- scythes
- set your own traps (aside from runes)
Love, BETHESDA!!
