I would like to see everything in one book. I really enjoy browsing through my Fantasy book.
I'd like Apocalypse, Spearhead, City Fight, Planet Strike, etc. all to be in the one book.
I would love to see all the stats, weapons, and FOC for each race. Fine, leave the point costs out, and stay with the codex system, but put tons of fluff in there, and I ought to be able to get a great feel for all the other races from this one book, without having to buy the enemy codex. All the psychic abilities could be in there.
I would love that...