I preordered a D800E this afternoon in Tokyo. But a few comments online about the benefits/disadvantages of not having the AA filter is making me have second thoughts. This will be my first FX camera (coming from D7000), and I'm really starting to get into DSLR video. One site seems to suggest that the lack of AA filter for video could be pretty bad. Another site states that the differences between the two cameras in terms of real world sharpness would be miniscule.
Who knows, we'll have to see until we have people testing production versions of both.
If it's your first FX and you are not 100% sure about the advantages/disadvantages of not having the optical low pass filter, you should probably go with the D800. Unless you are selling huge prints regulary and know you won't suffer from moiré/aliasing problems (or can avoid them), the D800E is not a good idea. Moiré is NOT easily dealt with in post. You can reduce color moiré but you won't be able to reduce pattern problems.
It is important to understand that at normal print sizes (until 20 inches wide!), you won't see any difference in sharpness between the D800 and the D800E. The only thing you will see, even at small sizes, is the moiré problems of the D800.
The D800E is mostly intended for landscape photographes and people who know they will need even more resolution than the D800 (which, seriously, is already much more than any DSLR to date). If you take pictures of human-made objects (buildings and cloths, for example), there is FAR more chances that you will be bothered with moiré rather than gaining little sharpness at pixel level.