I'm waiting for full release, the prelim reports coming through here indicate some creatures need re-balancing and the level of Myst seems in general to be too high for the feed back providers tastes already.

Thats from a scan of the forum posts only if you look at early adopter Videos even more detail is coming out.

Which given the Public Test nature of the new stuffs is reasonable.

Then there's the issue of will stuff you build on PT remain when it becomes the live branch? I see they are hedging their bets their (also correctly) If your not really attached to Base building then that's nod to starting now I guess.