They will want to send out the C7 with a bang because it's the end of that whole lineage of the front engined designs. Engine layout hasn't ever been touched since the corvette was introduced in 53'. Build the hype and light the C8 like a firecracker when it comes out and stun the world !
Plus going this route with the C7 that we're seeing taking shape here in a way stimulates interest in the C8 since now expectations are being set and more eye balls are being drawn in.
In a way this is testing the waters for moving up a level in potency