It's funny when I say the one without the helmet is my favorite because I don't like painting flesh. The helmet should have had sharper lines I think.
Ant news on release date?
Nothing as yet

I'm keen to get my hands on them.
I like the face option for a male Banshee, but not so much for a female banshee, it just looks weird, might just be the paint work though.
That's the most eldar face on an actual model that I've ever seen!
Yeah its rare to see a face, in the Eldar range, I think its a through back to 2nd edition where the exarchs never removed their armour and their bodies were eventually consumed by the armour. The Dire Avenger kit that got release with 4th ed has a face option, which is also when both those bits of lore disappeared from the codex.
the non-helmed Banshee head looks pretty cool, and I will be glad to have it for converting an Autarch with Banshee Mask.
Awesome idea except GW is moving away from the indexes for tournaments, so codex only options now