https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/60442
This is very exciting news for me and maybe for other Pentax adopters of the D800. This will allow one to use the record button to set your iso! For me this fixes my no.1 complaint of the D800, the fact that the iso needs to be set from the left shoulder. After years of shooting Pentax it became so convenient with the iso button placement on the right shoulder by the EV and shutter buttons. Now Nikon has allowed this for the D800. They also have added the function button for the remotes to be programmed as well. Some other bug fixes and functionality added to the WT-4 remote.
P.S. it works beautifully.