The new age of combat has come 40k is no longer the ground and pound your enemy it is evolving into the pound them from above. Games Workshop has release 3 new 40k kits due out in June.
The Space Marines, Orks and Necrons all have new flyers. Combine this with the storm raven, valkyrie, and the Dark Eldar flyers. 40k has see a dramatic increase of those things not marching along the ground. Also with 6th edition on the horizon the battles won't just be on the table top but well above them.