Yeah, with #3 on his/her way, I plan to update my DD's room if it's a girl. I like the colors I have in her room, but I want to add ladybugs. And, DD will be transitioning from a toddler bed to a full bed, so I have to get bedding anyways. And, I found the same bedding made in crib/toddler, twin, and full size. Yay!
For DS's room, I like it until he's about 5 and if this baby is a boy, it's all the more reason to keep the decor for about another 3 years.
I love to redecorate though. So, I know I'll be redoing at least one of the rooms in the next 3 years.