I have no explanation why removing something costs more ! 
its because they have to replace it with another filter.I read this on Nikon site somewhere . D800 is already a very specialized camera ,and D800E is for people ,who are coming from Medium format .
expect low availability, and price difference of about Rs 20-25K between D800 and D800E in India .
Ram I just came across a few high ISO pics from the D800 a
yes they are ok at high iso ,but there was lot of chroma noise even at 3200 iso ,but what else we can expect from 36MP cam.
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As of now I expect D800 to be priced at 1.60 lakhs and D800E to be priced at about 1.8 lakhs [MRP] .Street price will be slightly less .
Plus many will have to upgrade their pc's to cater 36MP files .