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Anyone know if the D800 will be able to use the ML-L3 remote that works with the D700, D90, etc?

Would be nice not to have to use the more expensive ones.
You cannot use the ML-L3 wireless remote with the D800, nor could you with the D700. The D800, like the D700, does not have an IR receiver built into it. There are non-Nikon brand wireless solutions for the 10-pin type of remote switch that these cameras require in addition to the fairly expensive wireless ML-3 (note, not the same as the ML-L3) system from Nikon. There are also plenty of wired solutions but they must be of the 10-pin variety which is not the same as used on the D7000 and many others.