The modules for the D800 and D800E will be much different. I'm sure when the D880E modules are out, you will love it. For fun try working with some of your old D700 NEF files. I'm sure that you will be impressed. If impressed with the D700 raw conversion think how happy you will be with raw conversion on the D800E.
When the D800E modules are ready simply download another "trial" using a different email address. Be sure to completely remove the first trial before attempting another download even when using another email address.
I have been a DXO user since the time I sold my D70s for a new D200. How many years has it been the D200 was new? Believe me you will love it!