I received my copy of "The Wolf of Wall Street" from amazon.it yesterday and, like "Rush", it is definitely a Steelbook. So, if this release of "Pompeii" goes ahead, I think we can be fairly certain that it will also be a Steelbook and not a FuturePak.
It will, however, undoubtedly have a printed back as both of the other titles do. I know that bothers some here but it doesn't bother me, especially as the Italian release is the only Steelbook release worldwide, to be announced to date. The French Steelbook release having been cancelled and replaced with a DigiPak.
One potential caveat, however, is that 01 Distribution were also scheduled to release a Steelbook of "The Legend of Hercules". That release never materialized. Hopefully, that won't happen with "Pompeii", especially as its release date is only 10 days away.