Lords of War will make future codex releases. While this was a part of conversation regarding Forgeworld models being included in normal 40k, this needed its own space for a couple reasons.
1. Lords of War being in a codex
2. Forgeworld only models being in a codex
Its important to know that when this will occur was not discussed. As Tyranids, and Imperial Guard are probably ready to go, I do not know if Lords of War will make these books.
Please remember that these are considered to be rumors.
via a must remain anonymous source
FW super-heavy type models will just get their rules printed into the codex under the Lords of War sections.