Our routine hasn't changed at all, but DS definitely brings on the drama when it's time for bed. He used to go to bed with no problems, but he has increasingly been full of tears when we say it's night night. He often cries himself to sleep, but sometimes he's so hysterical, I feel badly and will take him out of the crib and rock with him in the chair. But I know it's all an "act" because he soon becomes more interested in looking around for his toys than rocking and cuddling with mommy.
I just attribute it to his age and being too busy for bed. A's change of routine could be part of it; hopefully you'll have an easier time once things get more settled.