In a similar way to my Harlequin thread I'm looking for some advice and guidance.

First some history...

I was heavily into 40k since the Rogue Trader days and amassed a massive collection of models over the years. I stopped playing the game in 5th edition and I am now selling off most of my collection. I don't own 6th edition or any of the new codexes.

My nephew has started playing the game so I am keeping my blood angels and imperial guard as I understand there are now rules for allies. I also have a sizeable force of Daemonhunters. I played them as radicals so I have loads of metal Stormtroopers, Daemonhosts, Assassins, Inquisitors and their retinues. Is the Daemonhunter codex still valid in this edition? Will it get an update? Or do I need to buy the Grey Knight codex?

Thanks in advance for reading this!