I will cosleep- some- this time. I have with my other kids, and I'm finally at a space where I really want my body/bed/kid-free space carved out sometimes for my own well being.
Right now, I am still cosleeping with my three year old and two year old and um- I'm pretty much DONE. Love them dearly, but they need to sleep in their own space now because Mom has absolutely NO time to herself and it's taking a toll on her sanity. Over the next little while they will be um- encouraged- into their own space, particularly after we move and they have their own Really Cool Room!
The baby will certainly be invited to cosleep while nursing, but I plan to aim to have a crib set up for napping and for starting the night as often as possible. I would like him/her in their own space (mostly completely) by the time they are about a year old.
I know- it's not as 'attached' as I once was, and I may well feel differently then, but right NOW, I am actively planning to create a little more space for me as myself, and not just me as 'Mooooooooooommmmmmm!' I tend to struggle with PPD, and part of that for me has included a need to recognize that doing things for myself doesn't always mean I am not meeting the kids' needs. There has to be compromise or Mom is a really cranky, no-fun kind of Mom.