Ok, this is an expensive book, so lets take a look at what it is and what is inside of it. Its a big book! Literally over twice the size of a hardback codex.
6th edition Hardback Codex (all of them) 104 pages
Iyanden Codex Supplement (assuming all will be) 72 pages
6th Edition 40k Rulebook 432 pages
and the new Apocalypse Hardcover full color book sits at 296 pages
Please remember that nothing official is here, and these are still considered to be rumors.
The upcoming Apocalypse hard cover book is going to retail for $74.25.
Here are some of the new features inside
New Strategic Assets
Finest Hour: Warlords becoming heroes of legend
Sons of the Primarch: Space Marine and Chaos Space Marines calling upon the power of their Primarchs
Unnatural Disasters: Fate of the planet is decided
11 new formation types with over 100 apocalypse formations
Also something called War Zone: Armageddon. Fighting historical battles
Apocalypse Gamers Edition (direct only)
"Vortex Grenade" Case and Apocalypse Book
Can hold 4 super heavies or 16 normal tanks
3000 copies only
Apocalypse Collectors Edition (direct only)
A themed Inquisitor Coteaz's travelling case
individually numbered 'Order of Exterminatus' certificate on the lid
Apoc book split into a hardcover mini rulebook, Showcase section, Warzones 2, Datasheets for every formation.
60+ Asset Cards
Fold Out Reference Screen
1500 copies only