My last state of knowledge was November around. But as far as I know, nothing is fixed yet. I think there is a minimum period of 6 months or so where J&J is not allowed to spin off the shares. That would have to be sometime in October or so.
I also have a silly question about this. If I buy a J&J share these days, will I still get a spin-off share in October/November? Or is there a cut-off date?