I personally wish they would, mainly because I don't want
DCL to feel unnecessarily pressured to take additional "safety" steps like covering the deck 4 portholes which makes the deck less pleasant for everyone, when this is very likely a case of parental negligence. (And please, lay off the "don't judge" b.s. The most judgmental commenters I've seen on here are the ones castigating other posters who based on extensive DCL cruising experience simply state the obvious, that this accident was very likely caused by guests, not DCL.)
However, I very much doubt DCL will share any more info than the generic blurb they shared the first day. Dragging this out in public wouldn't help DCL's image, even if they could show proof they were no way at fault. And if local authorities were going to share footage, I think they already would have done so or indicated their plan to do so. I think they're happy to put this to bed, too, since it's a cruise ship and no one was seriously hurt.
DCL undoubtedly already knows exactly what happened. They have cameras everywhere. This accident was very likely caused by parental negligence, but it wouldn't serve DCL to state that publicly (either legally or in terms of public image). They will take whatever steps they need to take privately to protect themselves legally, including keeping quiet, and they will just move on from this.