Pteraxii
"Look its the bat guys from The Wizard of Oz."
- – Everyone after seeing this model
The Pteraxii is what appears to be the Mechanicus's version of a seraphim squad only cooler with more bat wings. They will be getting rules when the Archaeopter rules are out, but we can assume they will in fact fly (somehow). They get 12" AP -1 cover ignoring flamers and AP -1 claws that give +1S on the charge making them powerful deepstrikers AND making them a nightmare to charge.
At this point Admech can easily pass for an AoS army.