I'm planning on no batting in my Cal. King quilt when I get it ready to put together. Here are other threads from this board which address this very situation:
I want a light weight king quilt(? )
This one talks about tying the two layers together:
Tying a blanket
I hope this information helps you. My blocks are taking "forever" to finish. I just keep putting the whole thing off but will someday get them finished & just layer the front & back & quilt it for a summer spread.