Can't help you with the beta key but I can tell you it's fairly good. You'll immediately think, "What? I thought this was a new game, it looks just like WoW!" Yeah, but WoW didn't invent Orcs, Elves, etc.
So far I like the game MUCH better than WoW but in all fairness I'm bored out of my skull with WoW.
Just like WoW fixed a lot of pointless annoyances with EQ (insanely long down times, travel times, graphics, etc.) Warhammer seems to be poised to fix a bunch of WoW's pointless annoyances.
It does have its own stupidities though like looting sucks. It's often difficult to target the downed enemy to loot it and it's not clear enough that you've looted and where's autoloot? Speaking of targeting this is the area the game needs the most help with, targeting sucks. It's VERY hard to click on an enemy to select them and by the time you tab select a PvP target you're dead.
I do LOVE the public quests though. Great idea but they need to spread the love out a little more. I did one public quest maybe 5 -6 times and the highest I ever got was 8th, earning zero reward, because some higher level people (the people that got in on the preview probably) were sitting there nuking everything. That needs to be fixed.
Anyway, good effort so far, hopefully they will improve it instead of falling into the common trap of saying, "I'm the biggest, I don't have to change, users should change to how I want them to play." That's what happened to EQ. And now WoW is pretty much tapped out as far as content goes. It's boring as hell to do the same quests over and over again and it's impossible to play the good content with a quick solo or pick up group in WoW now days. I'm not even interested in the Lich King 'cause I sold my level 70 account and only have a level 50 priest now.