I am concerned about sleep issues and scheduling. Older LO has aways had a tough time sleeping. If your new LO will be sharing a room with your older LO, are you worried that the new baby waking frequently will upset your older DD? What about if you have the need to sleep train the younger LO, is that torture for the older LO to endure in the same room?
Re: s/o Toddler and infant/newborn sharing rooms...
My two will eventually share a room but not for awhile. I would be worried about all that you mentioned.
I have no idea how it is going to go and I am not making any definite plans because they usually don't work out!
No idea... I've been trying to figure this out. DS is 3 and doesn't consistently STTN. He has night terrors, and is now getting up to pee a couple times a night, so I have no idea what we're going to do. He comes into our bedroom a few times a night, so it doesn't really matter where the baby sleeps. He or she is just going to have to learn to sleep through noise.
I'm not worrying about it, because I can't do anything about it... we'll just have to wait and play it by ear.
We plan to have the boys eventually share a room but will probably wait until the DS number two is sleeping through the night. I don't think sleep training is realistic with another child in the room. While I've heard from friends who currently have two that the older will sleep through crying, this is for a limited period and not prolonged stretches. Our goal at least is to try and keep our current DS's routing, including sleep, as regular as possible after the baby comes.

David "BD" 2/8/07 Spencer 9/12/11