After being torn away from the Grey Knight codex, the Inquisition stand alone codex seems a little light on material (not that the Grey Knight one is much better). However, with these half dexes now in circulation, there leaves quite a bit of room for additional material, or at least a hard cover codex release at the minimum for the currently digital only Inquisition.
Please remember that these are rumors.
via Voice of the Chaos Gods
The inquisition will soon get a printed codex with a small release after being dropped from the GKs;
-1 week release
-No suppliment within the limited edition
If all hardcover books for 40k are published, GW wants to use the time more for "1-week special" releases like suppliments with new Models (beside fantasy armybooks and end times) until possible a new CSM codex comes at the summer.