Aion is sort of the successor to Lineage II. Those that have playe Guild Wars and Lineage know that NCSoft puts out a good product.
The beta won't be out until end of 2009 in the US but you can try out the Chinese version if you don't mind jumping through some hoops. (this is not for anyone that sucks at doing something a little challenging and researching a little)
....no seriously....don't attempt this if you aren't wanting to mess around a lot and still possibly not be successful in getting the beta to work. You'll only frustrate yourself.
Couple sites for you:
Main Aion website:
http://www.aiononline.com/us/
Two fan sites with lots of infoz:
http://www.aionsource.com/
http://www.aionglobal.com/
Lots of high quality videos to give you an idea of what the game looks like: (work your way lower and deeper into the videos to see some nice battle scenes)
Character generation and classes videos also there to see:
http://www.aiononline.com/us/media/video/video.html
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Guide for how to setup acct and play on the Chinese servers:
http://www.themondrated.com/showthread.php?t=4110
hey, if you don't have to work for it, it's not worth it!
Be SURE you generate a Chinese Adult ID when you get to that part in the guide otherwise you get booted after 5 hours as you have a child acct by default.
downloading the 5 files needed, I was getting 10+mbps so not bad. Just grab the five files as instructed. (~6+ gb)
Make sure you also grab the English patch linked from this thread:
http://www.neogaf.com/forum/showthread.php?t=357662
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I've only played for a few minutes to make sure everything worked. It took a little messing around but got the game patched etc.
This game is freaking gorgeous. Think Guild Wars but even better looking.
As I'm into character generation, I'll show some screens of my first attempt:

I'm in! Picking server (I chose Taranis for no particular reason)

Much like Warhammer/WoW etc, you can be one side of the other. You can't have characters on both sides.

Class choices are the same on both sides with male/female versions.

Another class. Descriptions are pretty basic.

You have TWO tabs full of facial adjustments in this game. Shown is one. Plenty of room to personalize your looks.

You also have some body adjustments. Thankfully, there are about 25 EXCELLENT premade looks you can start off with to modify. Everyone looks good. There are no ugly looks in Aion for the presets. I suppose you could uglify yourself though. Metal in this game looks amazing. Still pictures don't do it justice.

Winni is born! I created a warrior since I figured info for the Chinese beta would be scarce so a melee class might be a little easier to figure out.

Anyone that's played Guild Wars or Lineage (NCSoft) will recognize the style.

This game looks great visually, even better in game than in screens.
I haven't flown yet. i don't know if I sprout wings or if I have to earn those. Check out some of the links for the flying stuff etc. My images are from within 50 yards of the newbie spawn point so don't show much.
If you're bored and feeling adventurous and don't mind downloading 6GB worth of files with the chance you'll fail at getting it to run, it's worth a look. i think the beta will remain active through the 15th of May, the last I saw on one of the boards.