Just looking at the screen names on the threads and posts in the Beta Section, there are about 80 to 100 people who are actively posting issues (in that there are more than one post from them) and probably at least that many who have posted one thing they found. There are about 20 people who are super active on the boards compiling things.
Sounds like an active Beta Testing Group to me.
Then I'm probably wrong, I'm surprised to see that over 100 members were given the beta, I assumed it was much lower. As well they are only 1% so that means over 10,000 people entered. I thought it would be like 3,000 seeing as when you signed up you had to have an Xbox, a forum account, xbox live, over 18 and knew about the beta. Which really narrows down the amount of people who could enter.