There's been somewhat of a vocal group for playable Eldar since Rogue Trader came out. Having just finished Gav Thorpe's excellent Path of the Eldar trilogy last week, I've hopped back on the bandwagon.
Do you guys want to see playable Eldar? A Corsair or Corsair Prince career would fit the existing game very well, and I think you could build an entire game off of the regular Craftworlders if FFG really wanted to. Splitting it into just Path of the Warrior/Seer/Outcast would allow for diversity without clutter (just small packages for different aspects, Warlock, Farseer, Ranger, and Corsair, with potential for Harlequins later) would work well.
I did some really shoddy work on this a long time ago. Is there any interest for new work on this now?