Damn, I was going to post this. Beat me too it!
I'm pretty sure that this won't be a "covered up and provocative" sort of spread. Everyone's already seen that on the show! Besides, she's stated numerous times that she wouldn't have a problem with it.
I'm sure there will be some lesbian-esque poses if it's both Heidi and her. I can foresee Heidi being somewhat covered up, because I do think that Heidi had some regrets about the nudity thing on the show, but we sure know Jenna didn't.
I also question whether it will affect her Zeta membership. Aside from the hazing comments she made in Stuff or whatever magazine that was (do a search for a previous thread on the subject), her appearance on Survivor VERY much publicized the fact that she was a Zeta. It's not like she just mentioned it here or there.... she wore Zeta shirts, her luxury item was a Zeta crown. Every survivor fan out there knows that she is a Zeta.
I also can't believe that she shot it almost immediately after doing Letterman right after she won. It's also the fastest put together spread Playboy has ever done- they only had about 90 days from the shoot to get it ready.