At Gamescom, I had the opportunity to discuss the CE with the EU Namco team, who were more than happy to spell out EXACTLY how it's going to work.
The reason for the confusion is that the EU and US are getting slightly different things.
The US Collectors Edition consists of a metal case, with digital collectables, possibly a physical soundtrack and/or artbook. Because of the size of the metal case, the strategy guide has to be digital too.
The EU Collectors Edition is a folding cardboard-ey thing, you know what I mean. However, it comes with a physical making-of/behind the scenes thing, a physical art book, a physical soundtrack and a code for a digital strategy guide, because it made no sense to make two different guides for two different regions (looking at you, Atlus).
I will double check and update to see if the US one has any physical collectables, it's possible it doesn't.
Also worth noting is the fact that the EU version comes with codes for the digital versions of the art book/soundtrack etc as well as the physical ones.
