I love the 4e warforged. The only thing I miss is the immunities.
Sure, they didn't need to have the whole laundry list. But I would have liked to see a nod in that direction:
Construct Immunity: Warforged are immune to non-magical diseases and have Poison resistance 5.
And in exchange, they could still have limited their 'natural' healing somehow. I know, it doesn't fit with the new HP philosophy. Since it appears there is no mechanic at all for long-term damage (everyone always heals fully after an extended rest, even to the point of recovering all surges), how could they do it?
The warforged lifeseeker seems kind of pointless.