I need to say this, and here is as good a place as any
I just did a quest chain for the first time as an alliance toon. I'd done this storyline from the Horde side a few times, but this was the first time I got to see it from this side of the fight. The quest is "Return To Angrathar", and it's part of a rather epic quest line that ultimately used to end with "The Battle for Undercity". More on that in a few. The quest ends with a pretty cool cinematic, which I'll be kind enough to post here for it's raw epicness. It'll also bring you up to speed on the quest chain, or at least give you "The story so far" in a way.
But after this cinematic... That's it. Story line OVER.
tl/dr : this ending sucks.
The long explanation. Without the next few quests, there's a LOT of dangling problems here. I'm no red-shirt guy, but storyline wise this has created a huge consistency problems. Not to mention that Alexstrasza atill beckons you to come ot her, but only to re-show you the cinematic. This ending is, well, unsatisfactory at best.
The lack of an epic quest like "Battle for Undercity" aside, the storyline as it is now is just lacking. Honestly, it wouldn't take much for Blizzard to have made several workarounds to this whole thing. I'm going WAY far out there, bear with me.
We can start with a lampshading of the chronological problems of Northrend and Outlands. This would be pretty simple to address, simply have a keeper of time on the docks and the zeppelin bays. They could explain that it is of vital importance to go back in time and assure that things happen as they need to happen in the past to preserve the future. Problem solved. Heck, make it a plot point where you HAVE to talk to the keeper of time before you can go in there, at least then it's a speedbump that everyone slows down over and those interested could READ it.
Second idea would be a simple phasing issue. Phase the world for the player so they could do the last 5 quests of the chain, including battle for undercity. THEN add one more quest at the tail end, reporting to a keeper of time, and they could simply "correct" time, and you'd be back in Cata world and happy to know that you preserved the timeline as needed. And this could be done raid-party style in that "you begin this last part of the chain, you may not do any other quests until you are finished." Heck CHROMIE is in the region of this quest! You could talk to her (it?) to initiate this as a chain too!
REALLY! She wouldn't mind doing it!
Third is just a storytelling issue. If someone handed you a copy of, oh I'll choose something properly geeky here, "The Empire Strikes Back" and the last 20 minutes were removed, then a lot of "Return of the Jedi" simply wouldn't make sense. (spoilers here folks, you've been warned) Like the wholse scene where Luke calls Vader "father", or Why Lando is working with the rebels or... Ok you get the idea. They could have found a better way to wrap up the loose ends other than hacking them off with a machete. That's all I'm saying.
And yes, I CAN do better, thank you for asking. My JOB is to write schlock like this, I can do it in my sleep. I call those my nightmares. Blizzard has told me they don't want decent writers, so heck with them. And if they steal this idea, they could give me some game time as a thank you, but I won't expect it. Nobody ever thanks the guy who actually SOLVES these problems.
The Battle for Undercity (Horde / Alliance) had been one of the highest rated quests in the game. Seriously, it was the quest you looked forward to doing. You worked your tail off, grinded through almost two dozen quests to get there, and it was a quest you FELT like you just changed the world by completing. It also gave some rare insight to the motivations of the leaders of the horde and alliance. And now, just gone, cut off because they didn't take 5 minutes to think about it.
I play WOW for the story, and honestly this is more than a little disappointing. It's quite the storyline to get wrapped up in and then ultimately let down. I know that video games lately have this trend to make sucktastic endings, but this is pretty much the ultimate one for WOW. You guys can do better than this, I'm shocked you refuse to.
RELUCTANTLY I can understand abandoning this storyline, it doesn't fit with the Cata world because, in part, it involves THRALL who is now indisposed elsewhere. But on the other hand, Battle of Undercity was widely held as one of the best quests in the game. To trash it seems to be a waste, and a needless one at that. And far too many players will just roll over and say "oh well, it was cool, but they'll never put it back in." I think I demonstrated how htey could, if they chose to, but unless we demand it, they won't.
There. I said it. I feel better.