Without changing anything much
I'd probably keep the serpents. Do you need the chin cannons on the serpents? fast vehicles go 12" and fire one gun - once they drop off their cargo (dragons or wraithguard etc) they tend to die to angry retaliation strikes. I don't take chin cannons because I never actually get to use them.
I'd maybe save the points and try to get spirit stones or something to make the biggest threat more survivable.
But that's horses for courses - if your tank survives longer than just to drop its unit off, the bigger gun is nice.
Yeah hawks got a big kick with the grenade ruling :/
In list 2 you have 2 squads or hawks and a squad of dragons - take them as an aspect shrine. It costs nothing and they all get +1 BS.
BS5 shooting aspects (BS6 for exarchs) is too good not to use.
I wouldn't put banshees in a serpent. Not being able to charge out of the serpent after you deploy ruins them - they don't survive standing round for a turn next to a unit they want to charge...
What I'd do is have the banshees on foot next to the wraithknight.
If someone drops a pod into your lines to damage the wraithknight, you can then counter charge with the banshees. The banshees don't allow overwatch and can tie the unit up so then the 'knight can charge without worrying about overwatch too.
And if your opponent shoots the banshees, he's not shooting the knight ;)
You can then do what you like with the serpent - either save the points and bring something else or just take it as a tank
Overall, Dark elder aren't in a good place at the minute. There's no point taking a raider as battle brother allies can't start the game in each others transports (faq'd again - but it does stop things like culexus in a pod so overall, I like it)- so no raider/archon/dragon bomb. You can still do it without the raider though - just dropping in either an archon or a haemonculus with a web way portal with dragons is still allowed. But you'd still have to take a squad of kabalites. They won't do as much as an actual eldar unit in the game - but they'll probably be ignored for the same reason. I wouldn't put them in a raider either it'd just make them more of a target.
Deep striking fire dragons - or wraithguard with d-scythes niext to something you want dead tends to work
If you're interested in DE allies, have you seen the weekends pre-orders?
The Shattering of Biet-tan has has a new eldar faction called ynnari. They get formations with CWE, DE and harlequins so they can all be run as one army. Maybe, they'll be allowed in each others transports