Bleed- you will probably find similar opinions here on this board. I, too, believe this to be a closely-fought match with the possibility of it turning into a shoot-out. Could go either way. In fact, I have it down as a loss for my Packers, who tend to start slowly. Though, I wasn't aware of how banged up the Saints are until your post...
Regarding your question on health: The Packers are in fairly good shape at this point. Matthews continues to struggle with a hammy problem and a few of our receivers are bruised up. Mike Neal, our DE that is supposed to replace our big FA loss (Jenkins), continues to be made of glass and hasn't played much this pre-season. I don't know if he will see the field this week.
For your other question, all of the 16 players who were on IR last year are "back". Note however that "back" does not mean on the Packer's roster as many of them lost their spots and have either retired, are FAs, or have signed elsewhere. The key returnees are our starting RB (Grant), starting TE (Finley), and starting safety (Burnett), and the aforementioned DE (Neal). And, except for Neal, they are all ready to rumble.