This is pathetic on almost every level. Added at the last minute? That's a fail on management/planning. Fake "demonstration" shows they think it's acceptable to outright lie to their fans/customers. Not being honest and admitting they didn't have a live demo ready and were actually going to show pre-recorded video shows that they are just plain unprofessional.
Also, there is no way that footage was recorded from the Ivy hardware it was supposedly representing because if it was they would have been running both the recording software (Fraps?) and the game itself, which would have butchered performance, so obviously something more powerful than the Ivy Bridge hardware was used when recording that footage.
Now I know there is also a video showing the game on the hardware, but that doesn't clear Intel of the glorious ways in which they screwed up so badly here.