The FX sensor is physically 2.25 times the size of a DX sensor - which creates a lot more area for dust. The mirror box is relatively tight, making cleaning a little more difficult. There are some cases where shutter assemblies have been replaced due to problems with excess lubricant creating dust or debris.
If you are comfortable with using a blower and an occasional wet cleaning, it's probably a non-issue. If you are uncomfortable with any dust and it will bother you, you might even stay away from FX altogether. Using a blower is like putting gas in your car - it's necessary.
I have not needed to wet clean my D600 in the 6 months since I bought it. Just a blower has been adequate. I'm sure I can find dust if needed, but it doesn't show up very often with an aperture setting of f/11 or less.
There is no right or wrong answer as without any camera issues, you'll still have dust. I think the issue is under control now but you'll probably want to watch your camera and clean it for the first 1000 images or so.