Right you are Icarus2001, I had forgotten about that. They removed the forward toilet (to the relief of the cabin crew I believe!) and moved the rear galley cart stowage forward to where the toilet was to assist in squeezing in another row. If they didn't do that I think the new seats would of only allowed either one extra row or one and a half (the half being a row of three seats instead of five).
In regards to the seats I do not know if they are the same type that the FAA have told Delta to remove within five years due to crash survivability concerns.