Putting the divas match after HHH/Sheamus wouldn't be absurd. Like others have mentioned, they traditionally put the Divas match between two big-time matches, since the women's matches always suck and let the crowd rest. I suspect we'll see Jericho/Edge actually somewhere near the middle of the card, before HBK vs Taker, and possibly before Vince/Bret. HOF and the Divas match will be used as segments to let the crowd calm down from a big match and get ready for the next one.
I could see MITB opening the show. I could also see Punk/Rey opening the show, depending on where the storyline goes from here. If it's billed as a super personal hardcore match, then probably not. If it's going to be laid out similar to their Armageddon 2008, then it would be a good choice for an opener.