Congrats on the new tool! You are going to be so amazed once it's in your hands. I have been shooting my D4 for a couple months now and I am still in awe. I picked my my D90 today to box it up for eBay and it felt so weird in my hand. The D4 is a work of art and a real pleasure to shoot comfortably all day long if that's your goal.
I am not too sure about the membership, but personally I feel this is a more gear oriented sight, not a photo critique place. I am not against helping the brand out though. I just do it by buying their merchandise. The books are very well written, and I enjoy them thoroughly. There is a Nikonians workshop actually coming to my town, but unfortunately I am out of town fishing that week.