I bought my D800 when it introduced. This was my first time buying new camera when it launched. As most of the D800 users, my D800 got left AF issue, but the problem solved in July by Nikon Service Center.
For me, I would buy it if I really need it as I believe Nikon will solve the problem if there is any.
If you can wait for a few months, then it is good as price will drop and problems that arise will be solved.