The steelbook itself will still probably be identical.
Filmarena always produces great Full Slips when part of their FAC so you can rarely go wrong with their releases.
"Preparing" means exactly that, so they're still designing beauty shots and putting the information for this release out there. It has not been made available to order yet but the GB here on the forums will open soon and most likely a good time before you'll be able to pre-order direct from FA's site. No worries then as you have not missed it.
And if you want to be sure to get this, just sign up for the GB when it opens. For that, you just have to put your name, country and quantity down in the according thread which has not yet been opened. Just follow this thread (click on "Watch Thread" above) and you'll not miss out on any update shared for this release.