We really enjoyed the adventure (well, the part we got through before suffering from a TPK). In addition to a gnome sorcerer and dwarven cleric, our party contained a half-orc druid (me) and a human rogue (David). David's character was the only native Chelaxian, which actually proved pretty helpful a few times.
I can't really go into too much detail, but I will say that there was a lot of suspense, which provoked a lot of debating over which course of action to take (I always love that!). The battle that did us in was actually already pretty balanced, but we had some extraordinarily poor rolls, while the enemy enjoyed just the opposite.
My druid was kicking butt with her entangle spell, but alas, the spell's effect only reduces Dex mods instead of denying, so it was of little help to the rogue, and the defensive way in which I had cast the spell prevented easy flanking for not only them, but also ourselves.
Sean estimates that the playtest will take about 4 sessions to complete, and David and I are going to take turns blogging about it. Maybe his first blog will be better news than a TPK, but either way I know it will be a blast! Stay tuned.