That is a bit worrying... However, I'm pretty optimistic they will have rules for them in their though. All you really have to do is stick rules for the Corsair infantry in there and away you go. Hornets, Warp Hunter, Phoenix all that stuff will assuredly be in there.
Definitely something to keep an eye on though. That would really suck if they weren't featured because I know Corsairs have become really popular. Glad mine can translate pretty between Eldar and DE though. Yikes I'd be going berserk!