GW has clearly and understandably gone to a no-model-no-rules plan.
Yeah, but of the 5 new models/sets that came with this Codex, 4 of them already existed (admittedly in Finecast, which GW seems to be trying to move away from). Personally, I would rather have had Sliscus, Sathonyx and Malys (or Vect, or Kheradruakh) rather than a new Archon, Succubus and Haemonculus.
Also, the Wracks are nice, but I think Grotesques had a greater need of a plastic makeover - we are still stuck with a single (expensive, finecast) model with a single pose for a unit that has a minimum size of 3. Fortunately, there are plenty of options to convert other minis to fill this gap.
In fact, returning to the subject of fluff ... are we the only book of recent times not to get any new units? Because even the one truly new thing we got (Voidraven) already existed in the rules/fluff from the last book? Space Woves got the Stormfang; Orks got Morkanauts/ Gorkanauts; AM got Wyvern, Taurox, Bullgryns; Daemons got chariots and plague drones; Nids got the Hive Crone/Harpy; Smurfs got Centurions, Hunter/Stalker and Flyers; and Tau and Eldar got big walkers and flyers.
Not sure if the Grey Knights got anything though, nor the Sisters of Battle.
On the one hand, I don't mind, on the basis that I think we already have a good variety of units and almost uniformly great models (except perhaps the new Archon). On the other hand, it does give the impression that perhaps they just couldn't be bothered to apply any imagination to this codex...