I've a question about Harlequins, Can they be put in a Wave Serpent?
I know the Codex doesn't list them as having a transport but it doesn't say they cant either.
Also what has made Dire Avengers suddenly so good, I've always taken Banshees and Striking scorpions as my main troops.
Is there a change in the rules that helped them?
Yeah they can be put in a Wave Serpent! Only downside is you have to "borrow" a wave serpent from another unit that can take a Wave Serpent. Leaving the other unit without transport. See Latest FAQ on Dedicated transport.
Dire Avengers can put out 32 S4 Shots after getting out a transport in one round of shooting with Bladestorm. Also putting Dire Avengers in a Falcon (Dedicated Transport rule FAQS again) makes it a scoring unit. So instead of T3 easy to kill scoring units you have a tough robust Falcon. On the subject of Banshees and Striking scorpions i dont seem to have any luck with them as people kill them before they get the chance to hit! :(