Dark Heresy and us?

All th FFG games us th same system, yeah?

Are there stats for Dark Eldar (and more importantly their equipment) in any of the FFG books?

I believe they pop up in an adventure called "Purge the Unclean."

Rogue Trader has the option for Dark Eldar Player Characters in The Soul Reaver, with a Kabalite career path and virtually every piece of wargear in the codex. Wyches are available as a free expansion on 'The Dark Kin' on the website; which also comes with options for 'Skyterror'(Reavers/Hellions), 'Fleshcrafter' (Haemonculi/Lhamians), and 'Incubus Initiate' (I'll let you guess)

Technically a different system, but the 40k RPGs tend to be easy to convert.

There are also antagonist stats for quite a few of them - definitely mandrakes and Incubi off the top of my head - in Black Crusade.

No official rules except those mentioned above.

If it helps, I ran a fairly long Deathwatch sometime ago and put together a reasonably comprehensive collection of custom Dark Eldar stats. They're reasonably balanced, and were at least interesting, so I can make them available to you if you like.

That would be lovely. My prospective character spent some time in Commorragh as a slave, and later as a runaway, so I'd like to be able to use DE equipment sometime down the line. A Skyboard would be totally wicked.