Although we are only able to speculate at this time it can be reasonably be assumed this is tied to the current crowd supported HasLab Unicron project, which as of this writing has not yet met its quota. The deadline for HasLab's Unicron is early next month, and since Zeta Toys announced their Not-Unicron, HasLab's Unicron has actually seen a dip in orders.
Although there is no clear causation, with a character and Transformer fan event as big as Unicron, and with so much riding on the line, it would be safe to assume a correlation. Hasbro has not made large moves to stymie or silence most third party (or 3P) products, with toys clearly violating copyrights being manufactured in multiple numbers, for multiple hundreds of dollars, year after year.
This pretender to the Unicron throne disappearing from so many outlets so quickly would constitute a rare action on Hasbro's part.
So, if it's a Unicron you're after, it turns out there's one out there right now, and best of all he's the real deal. As time and again so many other Transformers are copied by third party companies, there is apparently one who won't stand for it.
To put in your order for the OFFICIAL HASLAB UNICRON CLICK HERE!
Share your thoughts in the forum and stay tuned to Seibertron as we will be bringing you any developments to this story.



