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Just had a couple quick questions about the Reaper's Wager detachment. It really looks like a fun detachment and has kind of rejuvenated my interest in my dark eldar army. Was thinking about picking up a bunch of harlequins, but before I did I wanted to ask. Can you still use grotmas detachments after an army book comes out? I know the army book rules supersedes all rules before it came out, and grotmas detachments usually aren't in the army books. Do you think rules for harlequins will be in the new dark eldar army book? If not, do I use the rules for harlequins from the downloadable index, or from the craftworld eldar army book? I should probably just wait until the dark eldar army book comes out, but some of the questions still stand either way. Thanks for any info!

Yes, you can use Grotsmas detachments in a new Codex.
Not sure for the rest.

The Grotmas Detachments are good for the duration of 10e.

There is no Harlequin index anymore. It was removed when the Eldar codex arrived. So you use the rules found in the Codex.

If the Drukari leaks (that I've seen) are accurate there's no Harli rules in the coming codex.