Italian justice is interminably slow, as in years and years slow. Of course it's not to say that anyone did or didn't do anything which was criminally negligent. I am surprised though that all the crew (bar one poor guy) escaped on the lifeboat, and so many of the passengers didn't.
I know this isn't exactly a "captain goes down with his ship" scenario, but even so, it would be fairly important to know what efforts were made to reach the passengers. Five of the six who died were found in one cabin, on the side of the ship which was facing upwards when it sank. It suggests that perhaps they were trying to stay in an air pocket.
As there were so many survivors it'll be interesting to see what's said by them, when the dust settles.