I like the scrunched look of an older quilt, so I wouldn't preshrink either batting or fabric.
However, I have a sister who uses 100% wool batting (her grandkids live in Alaska) ..I don't believe she has ever pre-shrunk, but then I'm not sure that she realizes that wool batting will shrink badly if washed. If I were to use wool batt, I surely would preshrink. It has occurred to me that I really should mention that to her, but she may know it.