Uh no. The DLC is finished but it needs to have bugs removed from it. They have a team working on it i'm sure but about a 1000 Beta testers is more effective then a room with a dozen people in it if they do their job and find bugs. If it was just for fans they would have made it for all consoles and it wouldn't be the full game. This is a Beta. Not a demo, Bethesda expects us to do our job and find bugs wherever they may hide so that the DLC will work right for everyone else. If you're not gonna bother to bug test then you don't deserve a Beta code.
You misunderstand me (and you're being rather presumptuous, don't you think?). Where in my post did I say that I wouldn't test it and/or submit feedback, or that I would recommend others to do the same? Oh, that's right -- I didn't say any such thing. If I am selected for the beta, I will give as much feedback as I possibly can, and I will be very grateful for the opportunities of both playing the DLC in advance, and contributing to its QA. But Bethesda does a lot of internal testing as well, and I think it's very reasonable to assume that they have ironed out most of the major problems with the DLC. The beta testers will be looking for more minor things, and I doubt there will be that many bugs/glitches for them to find, assuming my understanding of Bethesda's operations are accurate. I have participated in a few large scale public betas before, and each of them felt more like a way of reaching out to the players than a means of getting their feedback. That said, I will repeat myself before you make any further assumptions: if I am selected, I will be looking for bugs, I will give as much feedback as I possibly can, and I urge others to do the same.
On a separate note, I see a couple people have mentioned that filling in multiple applications will renew your application, rather than create new ones each time you submit. Can anyone confirm this (ideally with a link to an official Bethesda statement)? I'd like to update mine if possible; I've added another 6-8 hours to my Vampire character since I filled out my application, but I don't want to submit a new one unless I know it won't count as "cheating."