you crazy that there only going to do 1 beta that 2-3 weeks long lol !!!
it will run like this
1: load test see if servers can hold alot of people at 1 time most likley 2000-3000 logins minor bug reporting not alot will happen during the press/expanded beta
2: second beta most likley will happen in October near blizzcon a much cleaner versiion of beta all act 1 maybe some pvp testing this beta will include preorder people witch also tests on a larger number on the servers. last maybe a week
3RD will be november much larger beta even maybe all up to act 3 general public beta final test of servers to a heavy load and bug cleaning will last atlest a week
4th beta last beta mid december all but act 4 final boss world wide beta event to test all servers before going live mid january or very early febuary.
I have done alot of beta testing and some alpha testing this is a model timeline of testing a big game like this
Your crazy. Jay has clearly stated they want to reveal very little about the story and content. I do not see them opening up any more past act 1 of what they open up from the beginning.