Plans to unveil the slides during a symposium in Mexico City in May may have have been subverted by the leak of the slides online. A German man has reportedly took the slides featured in the trailer of the documentary and blew them up and enhanced them, revealing the slides. Interestingly, the being in the slides appears to be a mummified hydrocephalic child, and despite the claims made by the slide promoters that the being wasn't such.
The slides can be viewed at the below link:
UPDATE: It is being claimed that the slides are from an museum in Colombia. If so then the being could very well be an Andean mummy that was on display.