Not interested in the D5 itself perse but I am very curious which new capabilities and improved features it will bring to the Nikon DSLR line up.
Apparently the D5 will have 153 auto focus points with a much larger coverage, if so the D810 and D300s successors will probably also get this new AF module.
The D5 sensor will probably also end up in a Df MKII, even better if it can be combined with the new AF module instead of the consumer version it has now and even beterererer if both will be used in a true D700 successor (eg a compact high ISO race horse)
If the D5 isn't much of an improvement over the D4(s) it will at least drop the prices of the D4 and D4s which might become a more financial interesting option for my "something long" purchase in the near future.
And of course I'm very curious if the D5 will be a big "eat this" statement to the mirrorless uprising.