As the title suggest Games Workshop have just put some new flyers up for advance order which can be seen here. The rules for these models are in the latest White Dwarf. Both the Stormtalon (Space Marine) and the Orks seem to be configureable in either air to ground or air to air setups.
The Ork flyers look brilliant. They capture everything that is Orky and give it wings and a massive engine. Don't really like the Stormtalon very much tbh and the guns on either side of the hull just look plain stupid. Necrons have yet another great looking unit to add to their army.
I will let you know what the rules are like once I aquire the White Dwarf.