- Forge World is owned by Games Workshop. Why on earth would they only do test rules and unofficial works when their units are clearly designed for use in the newest system (6th ed 40k, 8th ed. Fantasy)? They wouldn't. That would be stupid.
- Apocalypse, an "Official" expansion to the Warhammer 40,000 universe utilizes 99% of everything Forge World makes and contains "Official" rules for these units. That alone makes them no different than units created for Planetstrike, Cities of Death, and any of the various Codecii currently available.
- and lastly there is this little affidavit in ALL current Forge World books:
3. Warhammer 40,000 Unit: This unit is intended to be used in 'standard' games of Warhammer 40,000, within the usual limitations of Codex selection and force organisation charts. As with all our models these should be considered 'official', but owing to the fact they may be unknown to your opponent, it's best to make sure they are happy to play a game using Forge World models before you start.
Seems to me that last little blurb, transcribed word for word (typos and all) from page 4 of the Imperial Armour 11:Doom of Mymeara book, kind of puts paid to that whole concept of Forge World rules not being official. So let's call that whole argument done with shall we?
I have to get back to reading the 6th ed rulebook... and my many plans within plans...
The Baron would be proud.