I've almost never pre-washed. Only if required for an exchange. Last Christmas, I did pre-wash for an exchange at our guild - luckily. Some Debbie Mumm fabric bled so much I thought there would be no color left.
I've used lots of batiks, never had a problem with them, either. Maybe I'd be a bit more careful if I'd bought them at Joanns? As I'm getting ready for a retreat, and am taking a project with two gorgeous reds, I thought I'd better wash it. One is a batik. No red came out at all. But now I have to prewash the rest, I think? I don't mind a little shrinkage, kind of like that wrinkly look, but think if I've done some of what will be used in a project, I've got to do all. It's just made extra work, as far as I'm concerned.
If you are worried about color bleeding, I'd take a white washcloth, dampen it and blot on the fabric to see if any color transfers. If you find you have to wash it, put it in a lingerie bag on delicate.
But if you don't HAVE to wash it, you can start sewing lots faster, lol.