So who doesn't love easter eggs huh? Especially from the past Elder Scrolls, I mean who else flipped while reading 'The Oblivion Crisis'? What I want is a DLC that gives us something from Oblivion and I've done some brainstorming, here's my ideas:

You start off hearing rumors about an Imperial mage in Solitude talking about teleportation.
After finding the mage in Solitude you discover he was hired by the emperor to create a teleportation portal linking the Imperial City and Solitude.
Some key parts to the portal have been stolen by some bandits and he requests you get them back.
(This would send you on about an hour of side quests.)
After getting all the parts, the mage gets the portals working and invites you to be the first to test it.
You arrive in the Imperial City (all the gates leaving the city will be blocked by guards due to the recent assasination of the emporer [Dark Brotherhood mission]) so you only get acsess to the Imperial City.
You will have acsess to the Arena questline once again as well as some minor side quests helping other people around the city.
Once sleeping in the Imperial City you get a dream where a cloaked man tells you to go to the Temple of the One and visit the shrine of Akatosh and Martin Septim.
After you enter the Temple you find the grave of the Champion of Cyrodil underneath the Statue of Akatosh guarded by two men.
You can examine the grave which causes you to enter 'cutscene mode' (no moving).
The man from your dreams teleports into the Temple, paralyzes you and kills the two guards.
He announces he is the descendant of Mankar Cameron and has been dedicating his life to reopening Tamriel to Oblivion.
He tells you the last ingredient he needed was the blood of a dragon. He then cuts you and takes some of your blood.
He then open a gate to Oblivion right in the Temple. He tells you how his paralysis spell is wearing off so while he goes looking for Mehrunes Dagon he will leave you a present.
He ressurects the Champion of Cyrodil (An Imperial wearing the Ceremonial Dragon Armor) and enters the oblivion gate.
You fight the Champion (EPIC!) and once you beat him the evil leaves his body and he speaks to you.
He tells you Mankar Cameron's son did not break Akatosh's seal, but only opened one hole, this gate.
He says you must close the gate before Dagon realizes he can use it to enter Tamriel.
He says he will help you destroy the gate and becomes your follower.
After entering the gate you find Mankar's son dead, slain by the deadra (Monsters in the gate would be like the clannfears, scamps, and deadroths)
After you get to the top of the tower the Champion tells you that you need to remove the sigil stone in order to close the gate.
The stone is worth lots of gold and has a one of a kind enchantment.
The Champion thanks you for helping him and gives you his sword (which happens to be dawnfang/duskfang)

Please give me your feedback and recommendations
Bethesda is you do end up doing something like this all I ask is that I get to beta test it lol
If any mod makers decide to do this just please put my name in the mod lol

Well i would love to revisit the imperial city, but one problem with that idea of yours is the fact the champion became sherogorath. He isn't dead.

Well he didn't really become Sheogorath like he wasn't a deadric prince. He simply got to rule Sheogorath's land.

Here you go http://www.gamesas.com/topic/1386134-future-dlc-suggestions-not-dawnguard-thread-3/

Was just about to link there, you did it for me.

That was actually pretty well thought out. I doubt Beth will listen to you, but if you know a modder, you should contact him.

No, because everyone CoC is different, not all CoC is Imperial, I agree with the idea but not with the appearance of CoC.

First of all, not everyone did the Dark Brotherhood quest.

Second of all, Dark Brotherhood spoilers.

Please use the http://www.gamesas.com/topic/1391441-future-dlc-suggestions-not-dawnguard-thread-4/