It's truly an unknown since the spawn area has to be changed as well. In the past, with things added (not biomes) there has been what people said, you have to have it un-seen through the fog of war and what not, be so many meters away, etc.

..however, this time, as I said, even the spawn area has to be changed so no one truly knows.

BTW, this is EA, everyone should be prepared to lose everything at any time, especially when it goes from Alpha (we are here) to gold.