I need to point out two things. First of all, I'm really excited for Historia, but I don't think Deconnick would write the main WW book until Historia is finished.
Second, I don't know if we can call Deconnick a star writer at DC. After all, Aquaman got cancelled due to how low her sales got. I heard some really interesting things about her run, but it still doesn't change the fact that her sales just aren't there at the moment.
Rorscharch and Strange Adventures are selling better than Wonder Woman. In fact, Rorschach is the best selling DC book outside the batfamily. Of course the Watchmen IP is helping a lot in that sense, but Strange Adventures is proof that he can do the same thing with a d list character.
And as far as him making Diana a seductress, I agree that the last thing I want is a romance between Bruce and Diana, and I'm certain that King wouldn't go there since he invested so much into Batman/ Catwoman. That one Batman story he wrote was all about the two of them not working out, and ignoring the romance, he actually wrote a really fun version of Diana.