*Kavatch rebuild - a rebuild for the city of Kavatch Do you know how long that would take? Are there even any mods for the PC for that?
*Online Fight Arena. Good luck with that one. Just go play tekken or something. Oblivion is basically a twink game. Nullifying enchants, and nerfing HP and Magicka to maintain some standard of fair play would just ruin the fun for a lot of people. And what do you do about the hackers?
Making an online version for Oblivion would require making an entirely new game. One based on TES ideas, but based entirely inside the arena. It would get very old, very quickly, and would ultimately be about who has the faster left mouse button mashing skills.
It might be fun, but it would probably be more work than it's worth. Just go play a multiplayer game, if you want that kind of experience.
*Vampire/Werewolf It'll probably be released in a later xpac. But you could always just go into console and make yourself a vampire again... oh... wait. You're on the xbox!
*New Armour and better weapons. You mean like stuff you can get in mods? Or can create in the construction set? Oh wait, xbox!
*More POWERFULL Soul Gems with better Magic Values in them so we can enchant bigger and better things Because PC players have it any better? Oh wait, PC players can use the construction set!
*A chance to return to Oblivion through some sort of portal after closeing all the gates in the main quest line.
PC players don't have it any different. Just close all the oblivion gates before you complete the main quest. They don't reopen anyway. That's kind of the point.
*More Dark Brotherhood quests they were the best in the game in my opinion. Or how about more mages guild quests? Or thieves guild? Fighters? They are what they are. Be satisfied. The game is over. Put it down, and return to your life. Please.
*Usefull spells i.e Levitate , Recharge Magic weapons
Levitate's not going to happen. Ever. A lot of the bigger buildings weren't made with physical roofs to save on poly count. It's also too close to cheating, as Morrowind players would commonly just levitate up, and then shoot fireballs or arrows or whatever at their attackers. It just unbalances the game, and makes acrobatics useless.
*And patches to sort out the glitches of the Game i miss Shadowmere were has he gone Okay. Your one valid point. Bethesda needs to fix the glitches.
I dont know about you guys but i want something special on Oblivion after completing every quest in the game i want more its like an addiction i find myself wandering for hours

with nothing to do but kill things now and love the game but just need more.
Roll a new toon and start over? Try to limit your play style? Only use fists? Don't fast travel? Only use vendor purchase spells? Don't enchant your items?
You can play the game any way you like, and that's what makes it so replayable.
Or you could, y'know, get the PC version and go wild. 's what most of the real addicts do. Mods made it possible for people to still play morrowind 5 years after release.