When GW release a FAQ, generic or DH specific addressing the upgrade issue I'll change the file. Until then the codex takes precedence. As a DH player I'd really like the upgrades
As noted earlier the sm dread is taken from the sm codex, it got upgraded, so did the allied sm dread
I checked earlier this week and still no updated FAQ, no reason not to nag them about it though.
Of course htere is nothing to stop you and your opponent agreeing otherwise.
Cheers