I guess, that Nutaku server will not be closed right after english DMM start only because of licence terms, imho it will be closed just after current licence will be over like it was with another DMM games many times (Aigis, GBR etc). DMM wants to have all money they can, they look at GBF sucsess at non-japaneese markets and definitely want to repeat it, so future of nutaku kamipro is not so bright, i hope that it will be transfer, but who knows... I definitely will not start from the beginning one more time.
At japaneese version a week ago at 21k jewels into wind boosted gacha i've got Hrae + Cybele.. to say that i was shocked is to say nothing, and in several days i read about DMM eng kamipro. I guess that it was a sign to drop nutaku completely and focus at DMM version.