I have not been an alpha/beta tester in any game so far (but I reported tons of bugs in PoE when it was released, so you could call me a gamma tester

)
So in D:OS1 you used the first map for testing, but in PoE they used something from the middle of the game.
How do you decide which area is used for testing?My first guess would be the town we saw in the Demo. The map is mostly finished, it is already known and you already had some test players. So now test players can look at game balance and people try out all kinds of crazy things they would not do if you watch over their shoulders while playing.