There's the new Compendium for Aeronautica Imperalis available to pre-order from the regular GW shop. But if you're looking for some new craft to fill out your Necron forces, you need to go to the Forge World side of things. You can order these new figures now.
From the article:
The Necron dynasties heard Aeldari aircraft were mopping up in Aeronautica Imperialis, so they’ve decided to get out of bed and blast them from the skies just to prove a point. Starting now, you can pre-order three brand new flyers to bring this lethal faction of malevolent robot skeletons into your games.