"(Also the fact that they presented the interior much earlier than the exterior could be an indicator for internal disagreements...)" - not necessarily, they did similar already back in the 1990ies, when the new line of front-engined GTs as successors to the mid/rear-engined Testarossa came up. At first some appetizers about the new way of building chassis (Ferrari had a decades old legacy of building rather outdated tubular space frame chassis), followed with tidbits about exterior and interior designs of at first the 456, and then the actual two-seater successor to the Testarossa, the 550.